902.18 Flashing Beacons (MUTCD Chapter 4S) - Revision history

Hoskir: /* {{SpanID|902.18.1}}902.18.1 General Design and Operation of Flashing Beacons (MUTCD Section 4S.01) */ updated broken links

2026-01-13T14:50:36Z

{{SpanID|902.18.1}}902.18.1 General Design and Operation of Flashing Beacons (MUTCD Section 4S.01): updated broken links

← Older revision		Revision as of 09:50, 13 January 2026
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	The removal or installation of a flashing beacon on the State Highway System requires approval of the District Traffic Engineer or designee.		The removal or installation of a flashing beacon on the State Highway System requires approval of the District Traffic Engineer or designee.

	'''Standard. '''Flashing beacon units, their mountings, signal visors, and backplates shall comply with the provisions of [[902.~~4 Signal Installations and Equipment~~ (~~MUTCD Chapter 4D~~) ~~#902.4~~\|EPG 902.4]] and [[902.5 Traffic Control Signal Indications (MUTCD Chapter 4E) #902.5 \| 902.5]] except as otherwise provided in this Article.		'''Standard. '''Flashing beacon units, their mountings, signal visors, and backplates shall comply with the provisions of [[902.4_Design_Features_of_Traffic_Control_Signals_(MUTCD_Chapter_4D)\|EPG 902.4]] and [[902.5 Traffic Control Signal Indications (MUTCD Chapter 4E) #902.5 \| 902.5]] except as otherwise provided in this Article.

	Beacons shall be flashed at a rate of not less than 50 or more than 60 times per minute. The illuminated period of each flash shall be a minimum of ½ and a maximum of ⅔ of the total cycle.		Beacons shall be flashed at a rate of not less than 50 or more than 60 times per minute. The illuminated period of each flash shall be a minimum of ½ and a maximum of ⅔ of the total cycle.
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	'''Option. '''An automatic dimming device may be used to reduce the brilliance of flashing yellow signal indications during night operation.		'''Option. '''An automatic dimming device may be used to reduce the brilliance of flashing yellow signal indications during night operation.

	Backplates (see [[902.~~4 Signal Installations and Equipment~~ (~~MUTCD Chapter 4D~~) #902.4.6\|EPG 902.4.6]]) may be used with flashing beacons.		Backplates (see [[902.4_Design_Features_of_Traffic_Control_Signals_(MUTCD_Chapter_4D)#902.4.6_Visibility,_Aiming,_and_Shielding_of_Signal_Faces_(MUTCD_Section_4D.06)\|EPG 902.4.6]]) may be used with flashing beacons.

	=={{SpanID\|902.18.2}}902.18.2 Intersection Control Beacon (MUTCD Section 4S.02)==		=={{SpanID\|902.18.2}}902.18.2 Intersection Control Beacon (MUTCD Section 4S.02)==

Hoskir: Renamed, renumbered and updated article due to MUTCD updates (See Special Ballot) moved from 902.12

2026-01-05T18:56:03Z

Renamed, renumbered and updated article due to MUTCD updates (See Special Ballot) moved from 902.12

Show changes

Hoskir: Hoskir moved page 902.12 Flashing Beacons (MUTCD Chapter 4L) to 902.18 Flashing Beacons (MUTCD Chapter 4S): renumbered and renamed due to MUTCD Update (See Special Ballot)

2026-01-05T18:55:10Z

Hoskir moved page 902.12 Flashing Beacons (MUTCD Chapter 4L) to 902.18 Flashing Beacons (MUTCD Chapter 4S): renumbered and renamed due to MUTCD Update (See Special Ballot)

← Older revision	Revision as of 13:55, 5 January 2026
(No difference)

Smithk: updated broken links

2022-02-23T13:53:24Z

updated broken links

← Older revision		Revision as of 08:53, 23 February 2022
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	'''Support.''' The following standard contracts are available:		'''Support.''' The following standard contracts are available:

	:* [~~http://wwwi/intranet/cc/contracts~~.~~asp?f=TR&nav=modot~~ TR8 - Installation of Roadside Flashers for School Operation]		:* [[153.21 Traffic\|TR8 - Installation of Roadside Flashers for School Operation]]

	:* [~~http://wwwi/intranet/cc/contracts~~.~~asp?f=TR&nav=modot~~ TR26 - Installation of Roadside Flashers for Emergency Vehicle Operation]		:* [[153.21 Traffic\|TR26 - Installation of Roadside Flashers for Emergency Vehicle Operation]]

	'''Standard.''' Plans for installation shall be the responsibility of the outside party and shall conform to the latest standards of MoDOT.		'''Standard.''' Plans for installation shall be the responsibility of the outside party and shall conform to the latest standards of MoDOT.

Smithk: /* 902.12.7 Procedures for Advance Beacon Installations by Outside Parties */ Per TS, updated School Flasher Packet

2021-02-22T16:07:28Z

902.12.7 Procedures for Advance Beacon Installations by Outside Parties: Per TS, updated School Flasher Packet

← Older revision		Revision as of 11:07, 22 February 2021
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	Once the contract is executed, a permit to work on MoDOT’s right-of-way shall be obtained by the outside party. Once issued, the outside party may proceed to install the beacons. A contractor or the outside party shall complete the installation; however, a licensed electrician shall supervise the installation. The outside party needs to coordinate with MoDOT prior to installation of the flasher to have MoDOT personnel verify hardware and equipment is acceptable for use on the state highway system. Upon completion of installation, MoDOT personnel shall verify correct installation prior to release of the permit and acceptance of the flasher.		Once the contract is executed, a permit to work on MoDOT’s right-of-way shall be obtained by the outside party. Once issued, the outside party may proceed to install the beacons. A contractor or the outside party shall complete the installation; however, a licensed electrician shall supervise the installation. The outside party needs to coordinate with MoDOT prior to installation of the flasher to have MoDOT personnel verify hardware and equipment is acceptable for use on the state highway system. Upon completion of installation, MoDOT personnel shall verify correct installation prior to release of the permit and acceptance of the flasher.

	General layouts are illustrated in [[media:902.11 Advance Flasher Figures 2012.doc\|Fig. 902.11 Advanced Flasher Figures]] and equipment listed in [[media:902.11 Appendix.doc\|Appendix]]. School speed limit flasher specific information is listed in [[media:902.12.7 packet.pdf\|School Flasher Packet]].		General layouts are illustrated in [[media:902.11 Advance Flasher Figures 2012.doc\|Fig. 902.11 Advanced Flasher Figures]] and equipment listed in [[media:902.11 Appendix.doc\|Appendix]]. School speed limit flasher specific information is listed in [[media:902.12.7 packet 2021.pdf\|School Flasher Packet]].

	All costs shall be the responsibility of the outside party. This includes but is not limited to installation and power; however, the signs and mounting brackets shall be supplied by MoDOT. All specifications shall be met to ensure the proper installation is in place.		All costs shall be the responsibility of the outside party. This includes but is not limited to installation and power; however, the signs and mounting brackets shall be supplied by MoDOT. All specifications shall be met to ensure the proper installation is in place.

Smithk: Per TS, guidance for when to install a school speed limit flasher assembly has been updated

2021-02-19T16:48:56Z

Per TS, guidance for when to install a school speed limit flasher assembly has been updated

← Older revision		Revision as of 11:48, 19 February 2021
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	'''Standard.''' Interactive flashing beacons shall be activated only when required.		'''Standard.''' Interactive flashing beacons shall be activated only when required.

	==902.12.7 Procedures ~~For~~ Advance Beacon Installations by Outside Parties==		==902.12.7 Procedures for Advance Beacon Installations by Outside Parties==

	'''Standard.''' Advance beacons such as: school warning, school speed limit, and emergency vehicle warning beacons are installed under contract. The district will obtain appropriate signed contracts ~~to be sent to Central Office~~ Traffic ~~for further handling~~. These contracts deal with the installation and transfer of ownership of the installation from the outside party to the Commission.		'''Standard.''' Advance beacons such as school warning, school speed limit, and emergency vehicle warning beacons are installed under contract. The district will obtain appropriate signed contracts and will follow execution guidelines in [[153.21 Traffic\|EPG 153.21 Traffic]]. These contracts deal with the installation and transfer of ownership of the installation from the outside party to the Commission.

	'''Support.''' The following standard contracts are available:		'''Support.''' The following standard contracts are available:

	:* [~~[153~~.~~21 Traffic\|~~TR8 - Installation of Roadside Flashers for School Operation]]		:* [http://wwwi/intranet/cc/contracts.asp?f=TR&nav=modot TR8 - Installation of Roadside Flashers for School Operation]

	:* [~~[153~~.~~21 Traffic\|~~TR26 - Installation of Roadside Flashers for Emergency Vehicle Operation]]		:* [http://wwwi/intranet/cc/contracts.asp?f=TR&nav=modot TR26 - Installation of Roadside Flashers for Emergency Vehicle Operation]

	'''Standard.''' Plans for installation shall be the responsibility of the outside party and shall conform to the latest standards of MoDOT.		'''Standard.''' Plans for installation shall be the responsibility of the outside party and shall conform to the latest standards of MoDOT.

	Once the contract is executed, a permit to work on MoDOT’s right-of-way shall be obtained by the outside party. Once issued, the outside party may proceed to install the beacons. A contractor or the outside party shall complete the installation; however, a licensed electrician shall supervise the installation.		Once the contract is executed, a permit to work on MoDOT’s right-of-way shall be obtained by the outside party. Once issued, the outside party may proceed to install the beacons. A contractor or the outside party shall complete the installation; however, a licensed electrician shall supervise the installation. The outside party needs to coordinate with MoDOT prior to installation of the flasher to have MoDOT personnel verify hardware and equipment is acceptable for use on the state highway system. Upon completion of installation, MoDOT personnel shall verify correct installation prior to release of the permit and acceptance of the flasher.

	~~Layouts~~ are illustrated in [[media:902.11 Advance Flasher Figures 2012.doc\|Fig. 902.11 Advanced Flasher Figures]] and equipment listed in [[media:902.11 Appendix.doc\|Appendix]].		General layouts are illustrated in [[media:902.11 Advance Flasher Figures 2012.doc\|Fig. 902.11 Advanced Flasher Figures]] and equipment listed in [[media:902.11 Appendix.doc\|Appendix]]. School speed limit flasher specific information is listed in [[media:902.12.7 packet.pdf\|School Flasher Packet]].

	~~With the exception of the signs and mounting brackets supplied by MoDOT, all~~ costs shall be the responsibility of the outside party. This includes but is not limited to installation and power.		All costs shall be the responsibility of the outside party. This includes but is not limited to installation and power; however, the signs and mounting brackets shall be supplied by MoDOT. All specifications shall be met to ensure the proper installation is in place.

	Beacons shall be active only during those times when the conditions of the ~~advanced~~ signing are applicable or when the enhancement of the signed message is needed. The times of operation, timing, and method of operation are approved by MoDOT.		Beacons shall be active only during those times when the conditions of the advance signing are applicable or when the enhancement of the signed message is needed. The times of operation, timing, and method of operation are approved by MoDOT.

			The contract shall establish responsibility for future maintenance, power costs, programming ownership, and replacement equipment.

			Flashing beacons shall only be installed on advanced signing or on school speed limit signing.

			Only one flasher assembly shall be permitted per approach.

	MoDOT will maintain installations and equipment unless otherwise indicated in the contract. Power costs after transfer of ownership to MoDOT and any other equipment off right of way are the responsibility of the outside party.

	~~Flashing beacons shall only be installed on advanced signing and shall not be installed at the condition applicable to the advanced signing.~~

	~~Only one flasher shall be permitted per approach.~~

Smithk: updated links

2020-12-15T17:22:10Z

updated links

← Older revision		Revision as of 12:22, 15 December 2020
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	'''Support.''' The following standard contracts are available:		'''Support.''' The following standard contracts are available:

	:* [[153.20 Traffic\|TR8 - Installation of Roadside Flashers for School Operation]]		:* [[153.21 Traffic\|TR8 - Installation of Roadside Flashers for School Operation]]

	:* [[153.20 Traffic\|TR26 - Installation of Roadside Flashers for Emergency Vehicle Operation]]		:* [[153.21 Traffic\|TR26 - Installation of Roadside Flashers for Emergency Vehicle Operation]]

	'''Standard.''' Plans for installation shall be the responsibility of the outside party and shall conform to the latest standards of MoDOT.		'''Standard.''' Plans for installation shall be the responsibility of the outside party and shall conform to the latest standards of MoDOT.

Smithk: Per TS, removed reference to archaic article

2020-08-26T16:28:21Z

Per TS, removed reference to archaic article

← Older revision		Revision as of 11:28, 26 August 2020
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	:* [[153.20 Traffic\|TR26 - Installation of Roadside Flashers for Emergency Vehicle Operation]]		:* [[153.20 Traffic\|TR26 - Installation of Roadside Flashers for Emergency Vehicle Operation]]

	~~See [[902.17 Execution of Contracts for Signal or Flasher Installation\|EPG 902.17 Execution of Contracts for Signal or Flasher Installation]] for additional information on execution of contracts.~~

	'''Standard.''' Plans for installation shall be the responsibility of the outside party and shall conform to the latest standards of MoDOT.		'''Standard.''' Plans for installation shall be the responsibility of the outside party and shall conform to the latest standards of MoDOT.

Smithk: Per TS, minor clarifications

2020-08-25T18:15:49Z

Per TS, minor clarifications

Smithk: /* 902.12.3 Warning Beacon (MUTCD Section 4L.03) */

2013-04-11T17:14:29Z

902.12.3 Warning Beacon (MUTCD Section 4L.03)

← Older revision		Revision as of 12:14, 11 April 2013
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	An Intersection Control Beacon is generally located over the center of an intersection; however, it may be used at other suitable locations.		An Intersection Control Beacon is generally located over the center of an intersection; however, it may be used at other suitable locations.

	==902.12.3 Warning Beacon (MUTCD Section 4L.03)==		==902.12.3 Warning Beacon (MUTCD Section 4L.03)==

	'''Support.''' Typical applications of Warning Beacons include the following:		'''Support.''' Typical applications of Warning Beacons include the following:

← Older revision		Revision as of 13:15, 25 August 2020
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	When used with good judgment, the installation of a flashing beacon can be an extremely effective traffic control device. However, indiscriminate use degrades their effectiveness and affects the usefulness of other flasher installations. Flashing beacons can be installed by MoDOT or by outside parties. An engineering study is to be performed to determine the need for them.		When used with good judgment, the installation of a flashing beacon can be an extremely effective traffic control device. However, indiscriminate use degrades their effectiveness and affects the usefulness of other flasher installations. Flashing beacons can be installed by MoDOT or by outside parties. An engineering study is to be performed to determine the need for them.

	Flashing beacons can be used in a number of different applications. The installation of flashing beacons at any location on the State Highway System is to be approved by the District Engineer. Likewise, the removal of any flashing beacons installed by MoDOT over any roadway shall also have prior approval from the District Engineer.		Flashing beacons can be used in a number of different applications. The installation of flashing beacons at any location on the State Highway System is to be approved by the District Traffic Engineer or designee. Likewise, the removal of any flashing beacons installed by MoDOT over any roadway shall also have prior approval from the District Traffic Engineer or designee.

	A number of flashing beacons present on state highways were installed and are operated by others. No concerted attempt to have them removed is to be engaged in except when such a flasher is considered a potential safety problem to the motoring public, or conditions have changed so a flasher is no longer needed. If these conditions occur, the organization operating the flasher is to be encouraged to remove it~~. However, if its operation is considered to be important to traveler safety, consideration is to be given for MoDOT to assume responsibility for operating and maintaining the flasher~~.		A number of flashing beacons present on state highways were installed and are operated by others. No concerted attempt to have them removed is to be engaged in except when such a flasher is considered a potential safety problem to the motoring public, or conditions have changed so a flasher is no longer needed. If these conditions occur, the organization operating the flasher is to be encouraged to remove it.

	'''Standard.''' Flashing Beacon units and their mountings shall comply with the provisions of [[902.5 Traffic Control Signal Features (MUTCD Chapter 4D)\|EPG 902.5]], except as otherwise provided in this article.		'''Standard.''' Flashing Beacon units and their mountings shall comply with the provisions of [[902.5 Traffic Control Signal Features (MUTCD Chapter 4D)\|EPG 902.5]], except as otherwise provided in this article.
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	Warning beacons may be installed in conjunction with emergency vehicle advance signing at the request of the emergency vehicle service district and at their cost.		Warning beacons may be installed in conjunction with emergency vehicle advance signing at the request of the emergency vehicle service district and at their cost.

	'''Standard.''' School warning beacons only operate when there is activity at the school or school crossing. When school speed limit signing is installed, beacons shall be installed with the signing. The beacons are only activated at times when the school speed limit applies.		'''Standard.''' School warning beacons only operate when there is activity at the school or school crossing. When school speed limit signing is installed, beacons shall be installed with the school speed limit signing. The beacons are only activated at times when the school speed limit applies.

	Emergency vehicle warning beacons are set up to operate only when emergency vehicles are exiting the station or garage on a duly authorized emergency run. As with the school beacons, these beacons enhance the meaning of the advanced signing by only flashing when emergency activity is occurring.		Emergency vehicle warning beacons are set up to operate only when emergency vehicles are exiting the station or garage on a duly authorized emergency run. As with the school beacons, these beacons enhance the meaning of the advanced signing by only flashing when emergency activity is occurring.
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	If used, the phrase WHEN FLASHING is required to be in the legend or on a supplemental plaque.		If used, the phrase WHEN FLASHING is required to be in the legend or on a supplemental plaque.

	'''Option.''' A Speed Limit Sign Beacon may be used with a fixed or variable Speed Limit sign. If applicable, a flashing Speed Limit Sign Beacon (with an appropriate accompanying sign) may be used to indicate that the displayed speed limit is in effect.		'''Option.''' A Speed Limit Sign Beacon may be included within the border of a School Speed Limit (S5-1) sign (see MUTCD Section 7B.15).

	A Speed Limit Sign Beacon may be included within the border of a School Speed Limit (S5-1) sign (see MUTCD Section 7B.15).

	==902.12.5 Stop Beacon (MUTCD Section 4L.05)==		==902.12.5 Stop Beacon (MUTCD Section 4L.05)==
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	'''Support.''' The following standard contracts are available:		'''Support.''' The following standard contracts are available:

	:* [~~http://wwwi/intranet/cc/contracts~~.~~asp?f=TR&nav=modot~~ TR8 - Installation of Roadside Flashers for School Operation]		:* [[153.20 Traffic\|TR8 - Installation of Roadside Flashers for School Operation]]

	:* [~~http://wwwi/intranet/cc/contracts~~.~~asp?f=TR&nav=modot~~ TR26 - Installation of Roadside Flashers for Emergency Vehicle Operation]		:* [[153.20 Traffic\|TR26 - Installation of Roadside Flashers for Emergency Vehicle Operation]]

	See [[902.17 Execution of Contracts for Signal or Flasher Installation\|EPG 902.17 Execution of Contracts for Signal or Flasher Installation]] for additional information on execution of contracts.		See [[902.17 Execution of Contracts for Signal or Flasher Installation\|EPG 902.17 Execution of Contracts for Signal or Flasher Installation]] for additional information on execution of contracts.