903.17 Overhead Sign Mounting - Revision history

Hoskir: updated content and renumbered due to MUTCD updates (See Special Ballot)

2025-12-31T15:39:43Z

updated content and renumbered due to MUTCD updates (See Special Ballot)

Hoskir: Hoskir moved page 903.4 Overhead Sign Mounting to 903.17 Overhead Sign Mounting: renumbered due to MUTCD Update (See Special Ballot)

2025-12-31T15:36:25Z

Hoskir moved page 903.4 Overhead Sign Mounting to 903.17 Overhead Sign Mounting: renumbered due to MUTCD Update (See Special Ballot)

← Older revision	Revision as of 10:36, 31 December 2025
(No difference)

Smithk: /* 903.4.1 Overhead Sign Installations (MUTCD Section 2A.17) */ Updating broken BR division link

2021-12-17T20:39:51Z

903.4.1 Overhead Sign Installations (MUTCD Section 2A.17): Updating broken BR division link

← Older revision		Revision as of 15:39, 17 December 2021
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	'''Standard.''' Trusses in paved medians with concrete traffic barrier shall be located to allow for barrier transitions and field adjustments of the underground storm culvert, if necessary.		'''Standard.''' Trusses in paved medians with concrete traffic barrier shall be located to allow for barrier transitions and field adjustments of the underground storm culvert, if necessary.

	[~~http~~://sp/sites/br~~/Pages/default.aspx~~ Bridge Division] shall design all bridge and wall mounted truss pedestals.		[https://modotgov.sharepoint.com/sites/br Bridge Division] shall design all bridge and wall mounted truss pedestals.

	'''Guidance.''' Supplemental guide signs for traffic generators should not to be mounted overhead for any highway system and should not be considered when determining whether to mount all guide signs overhead.		'''Guidance.''' Supplemental guide signs for traffic generators should not to be mounted overhead for any highway system and should not be considered when determining whether to mount all guide signs overhead.

Smithk: Updated website link for increased security

2021-10-26T20:05:17Z

Updated website link for increased security

← Older revision		Revision as of 15:05, 26 October 2021
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	Design data for both aluminum and steel span box trusses are shown on [https://www.modot.org/d-sheets Forms D-32 and D-33]. The contractor has the option to use steel or aluminum for span designs. Steel box trusses are used without option for all types of bridge-mounted trusses and for all butterfly and cantilever trusses.		Design data for both aluminum and steel span box trusses are shown on [https://www.modot.org/d-sheets Forms D-32 and D-33]. The contractor has the option to use steel or aluminum for span designs. Steel box trusses are used without option for all types of bridge-mounted trusses and for all butterfly and cantilever trusses.
	<div id="The standard footing for steel and aluminum box truss"></div>		<div id="The standard footing for steel and aluminum box truss"></div>
	The standard footing for steel and aluminum box truss structures is a spread footing. If a drilled shaft footing is determined to be necessary, the design of a drilled shaft footing by other than MoDOT will require submitted signed and sealed plans. The standard footing for box truss cantilever and butterfly structures is a drilled shaft footing or an optional spread footing. Savings may be realized by basing the foundation design on actual sign area rather than maximum and by using site specific geotechnical information. Upon request, Bridge Division will determine the most cost-effective design. Note that ample time must be allowed for this determination. See [~~http~~://epg.modot.org/index.php?title=Category:747_Bridge_Reports_and_Layouts#747.2.5_Other_Miscellaneous_Structures Guidelines for the Design of Miscellaneous Foundations] in Bridge Reports and Layouts for the proper procedure.		The standard footing for steel and aluminum box truss structures is a spread footing. If a drilled shaft footing is determined to be necessary, the design of a drilled shaft footing by other than MoDOT will require submitted signed and sealed plans. The standard footing for box truss cantilever and butterfly structures is a drilled shaft footing or an optional spread footing. Savings may be realized by basing the foundation design on actual sign area rather than maximum and by using site specific geotechnical information. Upon request, Bridge Division will determine the most cost-effective design. Note that ample time must be allowed for this determination. See [https://epg.modot.org/index.php?title=Category:747_Bridge_Reports_and_Layouts#747.2.5_Other_Miscellaneous_Structures Guidelines for the Design of Miscellaneous Foundations] in Bridge Reports and Layouts for the proper procedure.

	Truss designs for spans exceeding 160 ft., bridge, wall, and any special mounting conditions are requested from Bridge Division. See other areas in this section for truss design procedures involving the Bridge Division.		Truss designs for spans exceeding 160 ft., bridge, wall, and any special mounting conditions are requested from Bridge Division. See other areas in this section for truss design procedures involving the Bridge Division.

Smithk: Per BR and TS, in EPG 903.4.8 and .9, expanded and updated guidance for handling bridge sign attachments to current established practice. References to wall-mounted structures removed from EPG 903.4.8 and .9

2021-07-21T15:11:15Z

Per BR and TS, in EPG 903.4.8 and .9, expanded and updated guidance for handling bridge sign attachments to current established practice. References to wall-mounted structures removed from EPG 903.4.8 and .9

← Older revision		Revision as of 10:11, 21 July 2021
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	Fig. 903.4.1.1 shows an example of a one-arm span tubular structure cross-section. Other types of tubular steel structure designs require similar information as shown on this figure.		Fig. 903.4.1.1 shows an example of a one-arm span tubular structure cross-section. Other types of tubular steel structure designs require similar information as shown on this figure.

	==903.4.8 Bridge~~- and Wall~~-Mounted Signs==		==903.4.8 Bridge-Mounted Signs==

	'''Support.''' Bridges are utilized wherever possible to mount ~~guide~~ signs ~~and, possibly, sign trusses~~. This concept removes a potential roadside obstacle and any need for guardrail or concrete traffic barrier, and is generally more economical. The district requests Bridge Division to prepare details for bridge-mounted sign support brackets after preliminary sign location approval. Bridge Division prepares plans that are included in the appropriate bridge details. Bridge Division is responsible for [http://www.modot.mo.gov/business/contractor_resources/biditemslisting.htm bid items] and design of bridge and wall-mounted sign support brackets on new bridges. When retrofitting an existing bridge with a new bracket, Bridge Division designs the bracket and submits the plan to the district for inclusion into the roadway plans.		'''Support.''' Bridges are utilized wherever possible to mount overhead signs. This concept removes a potential roadside obstacle and any need for guardrail or concrete traffic barrier and is generally more economical.

	~~The sign and~~ sign brackets ~~are designed~~ to ~~provide a clear distance of 2 ft. from the outside edge of the~~ bridge ~~to the edge of the sign~~. ~~The sign has a maximum skew angle of 5 degrees to the roadway~~ for ~~which it is provided. The~~ sign ~~bracket is designed so the sign is visible~~ to ~~traffic at least 600 ft. ahead of the installation~~.		'''Standard.''' [http://sp/sites/br/Pages/default.aspx Bridge Division] shall prepare details for bridge-mounted sign support brackets that will be attached to new bridges and existing bridges that require other bridge work. Consultants shall prepare details for bridge-mounted sign support brackets that will be attached to existing bridges that do not require other bridge work.

	~~==903.4.9 Bridge- and Wall-Mounted Structure Designs==~~		:'''New Bridges:''' The district requests Bridge Division to prepare details for bridge-mounted sign support brackets after preliminary sign location approval. Bridge Division prepares plans that are included in the appropriate bridge details. Bridge Division is responsible for [http://www.modot.mo.gov/business/contractor_resources/biditemslisting.htm bid items] and design of bridge-mounted sign support brackets. The district shall provide the following information to the Bridge Division where applicable:
	'''~~Support.~~''' The [http://sp/~~sites~~/br/~~pages/default~~.~~aspx~~ Bridge Division~~] designs all~~ bridge- and ~~wall-mounted structure pedestals~~.		::* Project No., Bridge No. and letting date
			::* Dimensions of sign(s)
			::* For traffic under the bridge
			::::o number of lanes
			::::o width of lanes
			::::o shoulder dimensions
			::::o direction of traffic and dimension from centerline of roadway to the lanes under the bridge
			::::o identify the lanes receiving an overhead sign.

	~~For wall- and~~ bridge~~-mounts~~, ~~the district prepares and submits a sign support structure cross-section to~~ Bridge Division ~~for their concurrence of location, column type,~~ and ~~height. The~~ sign ~~dimensions and location over~~ the ~~roadway are included with the request~~. The district ~~coordinates design details with~~ Bridge Division ~~so pedestal details are included in the bridge or wall plans~~. ~~Bridge~~ Division is responsible for ~~design of pedestals for bridge- and wall-mounted structures~~ and ~~related pay items. The district is responsible for the design~~ of ~~the structure above the pedestal and related bid items~~.		:'''Existing Bridge (with other bridge work):''' When retrofitting an existing bridge with a new bracket, Bridge Division designs the bracket and incorporates the sign attachment sheets into the bridge plans. The district shall provide the same information to the Bridge Division as required for new bridges. Design Division is responsible for job special provisions related to removal and storage of existing signs.

	When retrofitting an existing bridge or ~~wall~~ with a new sign support structure, the preferred location and existing bridge ~~or wall~~ number is submitted to Bridge Division, along with the same data as required for a new bridge-mounted sign support structure. The incorporation of bid items is similar to new bridge-mounted sign support structures.		:'''Existing Bridge (no other bridge work):''' When retrofitting an existing bridge with a new bracket, the consultant designs the bracket and submits the plan to the district for inclusion into the roadway plans. For tracking purposes, the Bridge Survey Processor is contacted so a bridge rehab number can be assigned. A copy of the final sign attachment sheets is sent to the Bridge Survey Processor for incorporation with the existing bridge plans.

			The sign and sign brackets are designed to provide a clear distance of 2 ft. from the outside edge of the bridge to the edge of the sign. The sign has a maximum skew angle of 5 degrees to the roadway for which it is provided. The sign bracket is designed so the sign is visible to traffic at least 600 ft. ahead of the installation.

			==903.4.9 Bridge-Mounted Structure Designs==

			'''Support.''' Bridges are utilized wherever possible to mount sign support structures. This concept removes a potential roadside obstacle and any need for guardrail or concrete traffic barrier and is generally more economical.

			'''Standard.''' [http://sp/sites/br/Pages/default.aspx Bridge Division] shall prepare details for bridge-mounted sign support structures that will be attached to new bridges and existing bridges that require other bridge work. Consultants shall prepare details for bridge-mounted sign support structures that will be attached to existing bridges that do not require other bridge work.

			:'''New Bridges:''' For bridge-mounts, the district prepares and submits a sign support structure cross-section to Bridge Division for their concurrence of location, column type, and height. The sign dimensions and location over the roadway are included with the request. The district coordinates design details with Bridge Division so pedestal details are included in the bridge plans. Bridge Division is responsible for design of pedestals for bridge-mounted structures and related pay items. The district is responsible for the design of the structure above the pedestal and related bid items.

			:'''Existing Bridge (with other bridge work):''' When retrofitting an existing bridge with a new sign support structure, the preferred location and existing bridge number is submitted to Bridge Division, along with the same data as required for a new bridge-mounted sign support structure. The incorporation of bid items is similar to new bridge-mounted sign support structures.

			:'''Existing Bridge (no other bridge work):''' When retrofitting an existing bridge with a new sign support structure, the preferred location and existing bridge number is submitted to the consultant, along with the same data as required for a new bridge-mounted sign support structure. The consultant is responsible for design of pedestals and structure above the pedestal for bridge-mounted structures and all related bid items.

	==903.4.10 Non-Standard Sign Support Structures==		==903.4.10 Non-Standard Sign Support Structures==

Smithk: /* 903.4.6 Span, Cantilever and Butterfly Box Trusses */

2020-09-10T15:45:38Z

903.4.6 Span, Cantilever and Butterfly Box Trusses

← Older revision		Revision as of 10:45, 10 September 2020
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	* [[media:903.4.6.2.pdf\|Column design table for cantilever sign trusses]].		* [[media:903.4.6.2.pdf\|Column design table for cantilever sign trusses]].

	Design data for both aluminum and steel span box trusses are shown on [https://www.modot.org/~~media/16705~~ Forms D-32] and ~~[https://www.modot.org/media/16706~~ D-33]. The contractor has the option to use steel or aluminum for span designs. Steel box trusses are used without option for all types of bridge-mounted trusses and for all butterfly and cantilever trusses.		Design data for both aluminum and steel span box trusses are shown on [https://www.modot.org/d-sheets Forms D-32 and D-33]. The contractor has the option to use steel or aluminum for span designs. Steel box trusses are used without option for all types of bridge-mounted trusses and for all butterfly and cantilever trusses.
	<div id="The standard footing for steel and aluminum box truss"></div>		<div id="The standard footing for steel and aluminum box truss"></div>
	The standard footing for steel and aluminum box truss structures is a spread footing. If a drilled shaft footing is determined to be necessary, the design of a drilled shaft footing by other than MoDOT will require submitted signed and sealed plans. The standard footing for box truss cantilever and butterfly structures is a drilled shaft footing or an optional spread footing. Savings may be realized by basing the foundation design on actual sign area rather than maximum and by using site specific geotechnical information. Upon request, Bridge Division will determine the most cost-effective design. Note that ample time must be allowed for this determination. See [:http://epg.modot.org/index.php?title=Category:747_Bridge_Reports_and_Layouts#747.2.5_Other_Miscellaneous_Structures Guidelines for the Design of Miscellaneous Foundations] in Bridge Reports and Layouts for the proper procedure.		The standard footing for steel and aluminum box truss structures is a spread footing. If a drilled shaft footing is determined to be necessary, the design of a drilled shaft footing by other than MoDOT will require submitted signed and sealed plans. The standard footing for box truss cantilever and butterfly structures is a drilled shaft footing or an optional spread footing. Savings may be realized by basing the foundation design on actual sign area rather than maximum and by using site specific geotechnical information. Upon request, Bridge Division will determine the most cost-effective design. Note that ample time must be allowed for this determination. See [http://epg.modot.org/index.php?title=Category:747_Bridge_Reports_and_Layouts#747.2.5_Other_Miscellaneous_Structures Guidelines for the Design of Miscellaneous Foundations] in Bridge Reports and Layouts for the proper procedure.

	Truss designs for spans exceeding 160 ft., bridge, wall, and any special mounting conditions are requested from Bridge Division. See other areas in this section for truss design procedures involving the Bridge Division.		Truss designs for spans exceeding 160 ft., bridge, wall, and any special mounting conditions are requested from Bridge Division. See other areas in this section for truss design procedures involving the Bridge Division.

Smithk: Per TS, numerous minor clarifications

2020-09-10T15:22:57Z

Per TS, numerous minor clarifications

Show changes

Smithk: updated link

2020-07-02T13:24:04Z

updated link

← Older revision		Revision as of 08:24, 2 July 2020
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	'''Support.''' Bridge-mounted signs are no lower than the bridge, or 17 ft. 6 in., whichever clearance is lower.		'''Support.''' Bridge-mounted signs are no lower than the bridge, or 17 ft. 6 in., whichever clearance is lower.

	[[903.2 Extent of Signing#Fig. 903.2.26.1 Examples\|Figure 903.2.26.1]] illustrates some examples of the mounting height requirements contained in this portion of the article.		[[903.2 Extent of Signing#Fig. 903.2.18.1 Examples\|Figure 903.2.18.1]] illustrates some examples of the mounting height requirements contained in this portion of the article.

	==903.4.5 Guardrail==		==903.4.5 Guardrail==

Smithk: updated links

2018-11-08T15:21:31Z

updated links

Smithk at 13:07, 21 September 2018

2018-09-21T13:07:26Z

← Older revision		Revision as of 08:07, 21 September 2018
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	'''Support.''' Foundations of any type are not placed in pavement gores or other exposed locations. Every attempt is made to avoid special structure designs. Whenever possible, sign support structures are not mounted on bridges or walls, and are placed in areas which may already require guardrail or traffic barrier due to other obstacles.		'''Support.''' Foundations of any type are not placed in pavement gores or other exposed locations. Every attempt is made to avoid special structure designs. Whenever possible, sign support structures are not mounted on bridges or walls, and are placed in areas which may already require guardrail or traffic barrier due to other obstacles.

	Box span trusses (refer to [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~90310.pdf~~ Standard Plans 903.10] or [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~90360.pdf~~ 903.60]) may also support a cantilever support beyond one or both columns. This may help eliminate the need for a structure for the opposing traffic direction. Guide signs may be placed over the left hand lanes to utilize a span-cantilever design.		Box span trusses (refer to [https://www.modot.org/media/16927 Standard Plans 903.10] or [https://www.modot.org/media/16929 903.60]) may also support a cantilever support beyond one or both columns. This may help eliminate the need for a structure for the opposing traffic direction. Guide signs may be placed over the left hand lanes to utilize a span-cantilever design.

	Structure locations should be checked against existing and proposed underground drainage and utilities for potential conflicts. Structures in paved medians with concrete traffic barrier shall be located at a minimum of 150 ft. from median inlets to allow for barrier transitions and field adjustments of the underground storm culvert, if necessary.		Structure locations should be checked against existing and proposed underground drainage and utilities for potential conflicts. Structures in paved medians with concrete traffic barrier shall be located at a minimum of 150 ft. from median inlets to allow for barrier transitions and field adjustments of the underground storm culvert, if necessary.
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	==903.4.6 Span, Cantilever and Butterfly Box Trusses==		==903.4.6 Span, Cantilever and Butterfly Box Trusses==

	'''Support.''' Aluminum and steel span, combination span-cantilever, butterfly and cantilever box trusses are shown on [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~90310.pdf~~ Standard Plans 903.10], [~~http~~://www.modot.~~mo.gov/business/standards_and_specs~~/~~documents~~/~~90312.pdf~~ 903.12] and [~~http~~://www.modot.~~mo.gov/business~~/~~standards_and_specs~~/~~documents/90360.pdf~~ 903.60]. These types are used when the required span exceeds the 90 ft. maximum span of standard tubular supports, or when sign height, sign design area, or sign spread exceeds the limits of tubular support designs. Necessary information to complete truss data sheets for overhead trusses include:		'''Support.''' Aluminum and steel span, combination span-cantilever, butterfly and cantilever box trusses are shown on [https://www.modot.org/media/16927 Standard Plans 903.10], [https://www.modot.org/media/16928 903.12] and [https://www.modot.org/media/16929 903.60]. These types are used when the required span exceeds the 90 ft. maximum span of standard tubular supports, or when sign height, sign design area, or sign spread exceeds the limits of tubular support designs. Necessary information to complete truss data sheets for overhead trusses include:

	* [[media:903.3.5.1 Design Details Overhead Sign Trusses - Structural Steel.pdf\|Design details for structural steel overhead sign trusses]]		* [[media:903.3.5.1 Design Details Overhead Sign Trusses - Structural Steel.pdf\|Design details for structural steel overhead sign trusses]]

← Older revision		Revision as of 10:21, 8 November 2018
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	During construction the footing height may be adjusted up 6 in. or down 3 in. to match actual field conditions. This will avoid changes in the prefabricated post lengths and accommodate actual field conditions.		During construction the footing height may be adjusted up 6 in. or down 3 in. to match actual field conditions. This will avoid changes in the prefabricated post lengths and accommodate actual field conditions.

	'''Support.''' Aluminum and steel span, combination span-cantilever, butterfly and cantilever box trusses are shown on the standard plans. Details necessary to complete truss data sheets for overhead trusses are obtained from Fig. 903.4.1.3 and 903.4.1.5. Design data for both aluminum and steel span box trusses are shown on [~~http~~://www.modot.org/~~business~~/~~standards_and_specs/d-sheets.htm~~ Forms D-32] and [~~http~~://~~epg~~.modot.org/~~forms~~/~~DE%202017%20Forms/DELiaison/D-33.pdf~~ D-33]. The contractor has the option to use steel or aluminum for span designs. Steel box trusses are used without option for all types of bridge-mounted trusses and for all butterfly and cantilever trusses.		'''Support.''' Aluminum and steel span, combination span-cantilever, butterfly and cantilever box trusses are shown on the standard plans. Details necessary to complete truss data sheets for overhead trusses are obtained from Fig. 903.4.1.3 and 903.4.1.5. Design data for both aluminum and steel span box trusses are shown on [https://www.modot.org/media/16705 Forms D-32] and [https://www.modot.org/media/16706 D-33]. The contractor has the option to use steel or aluminum for span designs. Steel box trusses are used without option for all types of bridge-mounted trusses and for all butterfly and cantilever trusses.

	Truss designs for spans exceeding 160 ft., bridge-, wall- and any special mounting conditions are requested from Bridge. See other areas in this article for truss design procedures involving Bridge.		Truss designs for spans exceeding 160 ft., bridge-, wall- and any special mounting conditions are requested from Bridge. See other areas in this article for truss design procedures involving Bridge.
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	See Fig. 903.4.1.1 and [[media: 903.4.1 General Procedure.doc\|General Procedure for Overhead Span Box Truss Design]] for examples of span, cantilever and butterfly box truss cross-sections.		See Fig. 903.4.1.1 and [[media: 903.4.1 General Procedure.doc\|General Procedure for Overhead Span Box Truss Design]] for examples of span, cantilever and butterfly box truss cross-sections.

	Combination span-cantilever truss cross-sections require similar information. Tubular span, cantilever and butterfly sign supports are shown on the standard plans. Details necessary to complete [~~http~~://www.modot.org/~~business~~/~~standards_and_specs/d-sheets.htm~~ Form D-34] are shown on various drawings on the standard plans. These structures have limiting design factors including sign height, total sign area and sign spread, as noted on each drawing. When any one of these limits is exceeded, box type trusses are used.		Combination span-cantilever truss cross-sections require similar information. Tubular span, cantilever and butterfly sign supports are shown on the standard plans. Details necessary to complete [https://www.modot.org/media/16707 Form D-34] are shown on various drawings on the standard plans. These structures have limiting design factors including sign height, total sign area and sign spread, as noted on each drawing. When any one of these limits is exceeded, box type trusses are used.

	Quantities for concrete footings and various bolt-down heights and types of pedestals are shown in Fig. 903.4.1.4 and in the standard plans.		Quantities for concrete footings and various bolt-down heights and types of pedestals are shown in Fig. 903.4.1.4 and in the standard plans.
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	* [[media:903.4.6.2.pdf\|Column design table for cantilever sign trusses]].		* [[media:903.4.6.2.pdf\|Column design table for cantilever sign trusses]].

	Design data for both aluminum and steel span box trusses are shown on [~~http~~://www.modot.org/~~business~~/~~standards_and_specs/d-sheets.htm~~ Forms D-32] and [~~http~~://~~epg~~.modot.org/~~forms~~/~~DE%202017%20Forms/DELiaison/D-33.pdf~~ D-33]. The contractor has the option to use steel or aluminum for span designs. Steel box trusses are used without option for all types of bridge-mounted trusses, and for all butterfly and cantilever trusses.		Design data for both aluminum and steel span box trusses are shown on [https://www.modot.org/media/16705 Forms D-32] and [https://www.modot.org/media/16706 D-33]. The contractor has the option to use steel or aluminum for span designs. Steel box trusses are used without option for all types of bridge-mounted trusses, and for all butterfly and cantilever trusses.
	<div id="The standard footing for steel and aluminum box truss"></div>		<div id="The standard footing for steel and aluminum box truss"></div>
	The standard footing for steel and aluminum box truss structures is a spread footing. If a drilled shaft footing is determined to be necessary, the design of a drilled shaft footing by other than MoDOT will require submitted signed and sealed plans. The standard footing for box truss cantilever and butterfly structures is a drilled shaft footing or an optional spread footing. Savings may be realized by basing the foundation design on actual sign area rather than maximum and also using site specific geotechnical information. Upon request, Bridge will determine the most cost effective design. Note that ample time must be allowed for this determination. See [[:Category:747 Bridge Reports and Layouts#747.1.5 Other Miscellaneous Structures\|Guidelines for the Design of Miscellaneous Foundations]] in Bridge Reports and Layouts for the proper procedure.		The standard footing for steel and aluminum box truss structures is a spread footing. If a drilled shaft footing is determined to be necessary, the design of a drilled shaft footing by other than MoDOT will require submitted signed and sealed plans. The standard footing for box truss cantilever and butterfly structures is a drilled shaft footing or an optional spread footing. Savings may be realized by basing the foundation design on actual sign area rather than maximum and also using site specific geotechnical information. Upon request, Bridge will determine the most cost effective design. Note that ample time must be allowed for this determination. See [[:Category:747 Bridge Reports and Layouts#747.1.5 Other Miscellaneous Structures\|Guidelines for the Design of Miscellaneous Foundations]] in Bridge Reports and Layouts for the proper procedure.
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	==903.4.7 Tubular Steel Sign Supports==		==903.4.7 Tubular Steel Sign Supports==
	'''Support.''' Tubular steel span, cantilever and butterfly sign supports are shown on Standard Plans 903.05, 903.06, 903.07 and 903.08. Details necessary to complete [~~http~~://www.modot.org/~~business~~/~~standards_and_specs/d-sheets.htm~~ Form D-34] are shown on the standard plans. These structures have limiting design factors including sign height, total sign area, and sign spread, as noted on each drawing. When any one of these limits is exceeded, box type trusses are used.		'''Support.''' Tubular steel span, cantilever and butterfly sign supports are shown on Standard Plans 903.05, 903.06, 903.07 and 903.08. Details necessary to complete [https://www.modot.org/media/16707 Form D-34] are shown on the standard plans. These structures have limiting design factors including sign height, total sign area, and sign spread, as noted on each drawing. When any one of these limits is exceeded, box type trusses are used.

	Required information on cross-sections is similar to box truss cross-sections. For two arm spans between 40 and 75 ft., post lengths are in 3 in. increments. Post lengths for other designs are in 1 ft. increments. The foundation height above the ultimate ground line is designed as shown in the standard plans. During construction the foundation height may be adjusted up 6 in. or down 3 in. to match actual field conditions. This will avoid changes in the prefabricated post lengths and accommodate actual field conditions. The [[media:903.3.5.6 Concrete for Tubular Steel Support Footings.pdf\|quantities of concrete for tubular steel support footings]] have been tabulated and are also shown in the standard plans (see Fig. 903.4.1.2).		Required information on cross-sections is similar to box truss cross-sections. For two arm spans between 40 and 75 ft., post lengths are in 3 in. increments. Post lengths for other designs are in 1 ft. increments. The foundation height above the ultimate ground line is designed as shown in the standard plans. During construction the foundation height may be adjusted up 6 in. or down 3 in. to match actual field conditions. This will avoid changes in the prefabricated post lengths and accommodate actual field conditions. The [[media:903.3.5.6 Concrete for Tubular Steel Support Footings.pdf\|quantities of concrete for tubular steel support footings]] have been tabulated and are also shown in the standard plans (see Fig. 903.4.1.2).