620.15 Construction Inspection for Sec 620 - Revision history

Hoskir: Renamed, renumbered article due to MUTCD updates (See Special Ballot)

2026-01-06T16:15:42Z

Renamed, renumbered article due to MUTCD updates (See Special Ballot)

Hoskir: Hoskir moved page 620.12 Construction Inspection for Sec 620 to 620.15 Construction Inspection for Sec 620: renumbered and renamed due to MUTCD Update (See Special Ballot)

2026-01-06T16:14:30Z

Hoskir moved page 620.12 Construction Inspection for Sec 620 to 620.15 Construction Inspection for Sec 620: renumbered and renamed due to MUTCD Update (See Special Ballot)

← Older revision	Revision as of 11:14, 6 January 2026
(No difference)

Hoskir: /* 620.12.2.1 General (Sec 620.2.1) */ fixed spelling error

2024-09-17T20:50:29Z

620.12.2.1 General (Sec 620.2.1): fixed spelling error

← Older revision		Revision as of 15:50, 17 September 2024
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	(Sec 620.2.1.8)		(Sec 620.2.1.8)

	When shoulders are fog sealed, fog sealing should be kept out of rumble strips that are to contain a rumble stripe. Any overspray of fog seal material should be completely removed by a method approved by the engineer prior to placement of the rumble stripe. When surface preparation or pavement marking removal is required, the method of ~~sur-face~~ preparation or removal shall not cause structural damage to the pavement and shall meet the approval of the engineer. For all contract work '''the surface preparation area or removal area shall meet the following requirements''':		When shoulders are fog sealed, fog sealing should be kept out of rumble strips that are to contain a rumble stripe. Any overspray of fog seal material should be completely removed by a method approved by the engineer prior to placement of the rumble stripe. When surface preparation or pavement marking removal is required, the method of surface preparation or removal shall not cause structural damage to the pavement and shall meet the approval of the engineer. For all contract work '''the surface preparation area or removal area shall meet the following requirements''':

	:(a) Not be more than 1 in. wider than the pavement marking.		:(a) Not be more than 1 in. wider than the pavement marking.

Hoskir: updated link to Retroreflectometer Request in two places

2023-04-19T20:08:26Z

updated link to Retroreflectometer Request in two places

← Older revision		Revision as of 15:08, 19 April 2023
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	\|'''Forms'''		\|'''Forms'''
	\|-		\|-
	\| [[:~~media:620~~.~~10 Third Party Retroreflectivity Request June 2012~~.~~xls\|Third Party Retroreflectivity~~ Request]]		\| [https://epg.modot.org/forms/CM/Retroreflectometer_Request.xlsm Retroreflectometer Request ]
	\|}		\|}

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	For construction projects 0.5 mi. or shorter, portable handheld retroreflectometers, such as the Mirolux 30 retroreflectometer, should be used in lieu of a mobile retroreflectometer to take retroreflectivity readings on permanent and temporary pavement marking. Measurements should be made in accordance with [[:media:620.10 MoDOT T80.pdf\|MoDOT Test Method TM 80]]. All measurements should be made in the direction of traffic flow, except on the centerline of two-lane roads where the required number of measurements should be made in each direction. Both single and double lines are to be measured, and the acceptance criteria should be applied for each line in both directions. Inspectors should realize that the Mirolux 30 machine normally shoots a beam of light approximately 6 to 12 inches. in front of the machine's lens. Therefore, the lens should be located approximately 6 to 12 in. from the flat area of rumble stripes. When the light falls in the bottom of the rumble, the retroreflectivity readings are usually lower than the backside or top of the rumble area because of the change of light beam angle, and for that reason, care should be taken to avoid taking readings in the bottom of the rumble. If handheld retroreflectometer results are disputed by the contractor, a mobile retroreflectometer may be requested for dispute resolution.		For construction projects 0.5 mi. or shorter, portable handheld retroreflectometers, such as the Mirolux 30 retroreflectometer, should be used in lieu of a mobile retroreflectometer to take retroreflectivity readings on permanent and temporary pavement marking. Measurements should be made in accordance with [[:media:620.10 MoDOT T80.pdf\|MoDOT Test Method TM 80]]. All measurements should be made in the direction of traffic flow, except on the centerline of two-lane roads where the required number of measurements should be made in each direction. Both single and double lines are to be measured, and the acceptance criteria should be applied for each line in both directions. Inspectors should realize that the Mirolux 30 machine normally shoots a beam of light approximately 6 to 12 inches. in front of the machine's lens. Therefore, the lens should be located approximately 6 to 12 in. from the flat area of rumble stripes. When the light falls in the bottom of the rumble, the retroreflectivity readings are usually lower than the backside or top of the rumble area because of the change of light beam angle, and for that reason, care should be taken to avoid taking readings in the bottom of the rumble. If handheld retroreflectometer results are disputed by the contractor, a mobile retroreflectometer may be requested for dispute resolution.

	For construction projects longer than 0.5 mi., a mobile retroreflectometer should be used. Mobile retroreflectivity readings are taken by a third party contractor hired by MoDOT. To provide the third party contractor with the required information for taking the readings, the [[:~~media:620~~.~~10 Third Party Retroreflectivity Request June 2012~~.~~xls\|Third Party Retroreflectivity~~ Request]] form should be completed and sent to the Construction and Materials Division as soon as the markings are placed.		For construction projects longer than 0.5 mi., a mobile retroreflectometer should be used. Mobile retroreflectivity readings are taken by a third party contractor hired by MoDOT. To provide the third party contractor with the required information for taking the readings, the [https://epg.modot.org/forms/CM/Retroreflectometer_Request.xlsm Retroreflectometer Request] form should be completed and sent to the Construction and Materials Division as soon as the markings are placed.

	For all maintenance contract projects, regardless of the length of project, retroreflectivity measurements are provided by the contractor with an approved third party contractor using a 30- meter geometry retroreflectometer. The readings are to be performed as required by each individual contract.		For all maintenance contract projects, regardless of the length of project, retroreflectivity measurements are provided by the contractor with an approved third party contractor using a 30- meter geometry retroreflectometer. The readings are to be performed as required by each individual contract.

Smithk: Per TP, updated Major Highway System map

2022-06-03T13:14:50Z

Per TP, updated Major Highway System map

← Older revision		Revision as of 08:14, 3 June 2022
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	===620.12.2.2 Permanent Pavement Marking ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 620.2.2])===		===620.12.2.2 Permanent Pavement Marking ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 620.2.2])===

	On all [[media:144 Major Highway System ~~2021~~.pdf\|major routes]], all permanent pavement marking white lines and yellow edge lines should be 6 in. wide. Therefore, all divided highways, unless given an exception by the Central Office, should be 6 in. wide.		On all [[media:144 Major Highway System 2022.pdf\|major routes]], all permanent pavement marking white lines and yellow edge lines should be 6 in. wide. Therefore, all divided highways, unless given an exception by the Central Office, should be 6 in. wide.

	All other permanent pavement marking yellow lines, such as on the centerline of two-lane highways or other roadways where lane lines have double pavement marking stripes, should be 4 in. wide.		All other permanent pavement marking yellow lines, such as on the centerline of two-lane highways or other roadways where lane lines have double pavement marking stripes, should be 4 in. wide.

Smithk: Per CM, removed archaic SiteManager info and replaced with AASHTOWARE info

2021-10-01T16:10:35Z

Per CM, removed archaic SiteManager info and replaced with AASHTOWARE info

← Older revision		Revision as of 11:10, 1 October 2021
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	'''Basis of Payment (Sec 620.90.3.6)'''		'''Basis of Payment (Sec 620.90.3.6)'''
	A new line item adjustment type has been added in ~~SiteManager~~ titled "Retroreflectivity Adjustment". Please associate any adjustment based on the criteria provided above in [[#620.10.2.4 Acceptance (Sec 620.2.4)\|Acceptance (Sec 620.2.4)]] to this new adjustment type.		A new line item adjustment type has been added in AASHTOWARE Project (AWP) titled "Retroreflectivity Adjustment". Please associate any adjustment based on the criteria provided above in [[#620.10.2.4 Acceptance (Sec 620.2.4)\|Acceptance (Sec 620.2.4)]] to this new adjustment type.

	Guidance for [[#620.10.2.4 Acceptance (Sec 620.2.4)\|Acceptance (Sec 620.2.4)]] provides deductions for unacceptable retroreflectivity epoxy pavement markings. A new line for adjusting the price for epoxy pavement markings has been added to ~~SiteManager~~, titled "Retroreflectivity Adjustment," for this purpose. Applicable deductions should be made by a change order, as follows: Underrun the original pay item at the contract unit price for whatever quantity is not being paid at the full contract unit price, then include a line or lines as necessary showing the same item number, but now as an overrun with the applicable adjusted unit price.		Guidance for [[#620.10.2.4 Acceptance (Sec 620.2.4)\|Acceptance (Sec 620.2.4)]] provides deductions for unacceptable retroreflectivity epoxy pavement markings. A new line for adjusting the price for epoxy pavement markings has been added to AWP, titled "Retroreflectivity Adjustment," for this purpose. Applicable deductions should be made by a change order, as follows: Underrun the original pay item at the contract unit price for whatever quantity is not being paid at the full contract unit price, then include a line or lines as necessary showing the same item number, but now as an overrun with the applicable adjusted unit price.

	==620.12.8 Snowplowable Raised Pavement Markers ==		==620.12.8 Snowplowable Raised Pavement Markers ==

Smithk: /* 620.12.2.2 Permanent Pavement Marking (Sec 620.2.2) */ updated major highway system map

2021-06-04T15:46:25Z

620.12.2.2 Permanent Pavement Marking (Sec 620.2.2): updated major highway system map

← Older revision		Revision as of 10:46, 4 June 2021
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	===620.12.2.2 Permanent Pavement Marking ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 620.2.2])===		===620.12.2.2 Permanent Pavement Marking ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 620.2.2])===

	On all [~~http~~:~~//wwwi/intranet/tp/documents/Major_Highway_System~~.pdf major routes], all permanent pavement marking white lines and yellow edge lines should be 6 in. wide. Therefore, all divided highways, unless given an exception by the Central Office, should be 6 in. wide.		On all [[media:144 Major Highway System 2021.pdf\|major routes]], all permanent pavement marking white lines and yellow edge lines should be 6 in. wide. Therefore, all divided highways, unless given an exception by the Central Office, should be 6 in. wide.

	All other permanent pavement marking yellow lines, such as on the centerline of two-lane highways or other roadways where lane lines have double pavement marking stripes, should be 4 in. wide.		All other permanent pavement marking yellow lines, such as on the centerline of two-lane highways or other roadways where lane lines have double pavement marking stripes, should be 4 in. wide.

Smithk: /* 620.12.2.4 Acceptance (Sec 620.2.4) */Per CM, deleted the paint/marking table since this info is duplicated in Sec. 620. Revised the preceding paragraph with new verbiage pointing the reader to Sec. 620.40.

2019-07-03T13:18:00Z

620.12.2.4 Acceptance (Sec 620.2.4): Per CM, deleted the paint/marking table since this info is duplicated in Sec. 620. Revised the preceding paragraph with new verbiage pointing the reader to Sec. 620.40.

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 <div id="The rough and irregular surface"></div>
-The rough and irregular surface of a seal coat treatment can have an impact on the ability of the pavement marking to provide retroreflectivity readings meeting Sec 620.2.4.  The following table is provided for pavement marking on seal coat treatments when, in the opinion of the engineer, the rough surface texture of the seal coat is the cause for readings that do not meet the requirements of Sec 620.2.4:
+A chart designating retroreflectivity acceptance requirements and payment adjustments for painted and durable pavement marking lines can be found in Sec 620.40.2.2.4.  Due to the rough and irregular surface of Seal Coat, the chart includes a lower (pass/fail) threshold of 150 millicandelas/m<sup>2</sup>/lux for this type of surface.  This lower requirement only applies to Seal Coat placed in accordance with Sec 409 and does not apply to scrub seal, microsurfacing, UBAWS, open-graded hot mixes, or any other type of pavement surface.
 On maintenance restriping contracts, the intent is to require retroreflectivity readings that comply with the retroreflectivity numbers in the specifications. However, consideration of pavement condition needs to be part of the equation. Sections of roadways where retroreflectivity numbers indicate replacement should be physically inspected to determine the pavement condition. Pavement surfaces that are rough, broken, cracked, raveled or severely aged may not meet the retroreflectivity requirements of a good surface. The inspector should use engineering judgment to determine what impact the pavement condition has on the quality of the line if it isn’t covered in the contract. Please note, most maintenance restriping contracts now provide less stringent retroreflectivity requirements. Another factor that can impact the retroreflectivity readings is the width of the line read. Where the new line has been placed on an old line that is 5 in. or wider, the retroreflectivity readings may be impacted by the old line beyond of the new stripe. In such cases, retroreflectivity readings should be adjusted accordingly.

Smithk: updated link

2019-06-07T14:18:58Z

updated link

← Older revision		Revision as of 09:18, 7 June 2019
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	For visibility and safety, it is critical that the following standards are enforced:		For visibility and safety, it is critical that the following standards are enforced:
	:(1) Temporary lane marking durations of less than two weeks need to be placed in accordance with [~~http~~://www.modot.~~state.mo.us~~/~~business~~/~~standards_and_specs/documents/62010.pdf~~ Standard Plan 620.10]. Specifically, lane markings with temporary tape or paint shall be 4 ft. long with 36 ft. gaps.		:(1) Temporary lane marking durations of less than two weeks need to be placed in accordance with [https://www.modot.org/media/16897 Standard Plan 620.10]. Specifically, lane markings with temporary tape or paint shall be 4 ft. long with 36 ft. gaps.
	:(2) In accordance with Sec 620.2.5.2 ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Section 620]), any temporary pavement marking damaged, displaced or missing should be replaced at the contractor’s expense within two hours upon notification from the engineer with the following exception.		:(2) In accordance with Sec 620.2.5.2 ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Section 620]), any temporary pavement marking damaged, displaced or missing should be replaced at the contractor’s expense within two hours upon notification from the engineer with the following exception.
	:(3) In accordance with Sec 620.2.2, on roadways opened to traffic, permanent pavement marking should be in place no later than five days after final paving operations. In all other cases, operations should be scheduled, as much as possible, to comply with Sec 620 of the standard specification. For projects requiring permanent pavement markings to be installed in rumble strips, the final paving operation should be considered as the time of completion of the rumble strips. However, operations should be mobilized by the contractor to minimize the time between when the traveled way was opened to traffic and when permanent pavement markings are installed. For such operations when the roadway is opened to traffic for an extended time with temporary pavement markings, it is critical for the contractor to maintain the pavement markings strictly in accordance with the specifications, especially temporary pavement edge marking requirements.		:(3) In accordance with Sec 620.2.2, on roadways opened to traffic, permanent pavement marking should be in place no later than five days after final paving operations. In all other cases, operations should be scheduled, as much as possible, to comply with Sec 620 of the standard specification. For projects requiring permanent pavement markings to be installed in rumble strips, the final paving operation should be considered as the time of completion of the rumble strips. However, operations should be mobilized by the contractor to minimize the time between when the traveled way was opened to traffic and when permanent pavement markings are installed. For such operations when the roadway is opened to traffic for an extended time with temporary pavement markings, it is critical for the contractor to maintain the pavement markings strictly in accordance with the specifications, especially temporary pavement edge marking requirements.

Smithk: /* 620.12.2.3 Inspection (Sec 620.2.3) */ Per CM, further revised to accord with Sec 620.40

2018-08-24T19:40:03Z

620.12.2.3 Inspection (Sec 620.2.3): Per CM, further revised to accord with Sec 620.40

← Older revision		Revision as of 14:40, 24 August 2018
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	===620.12.2.3 Inspection ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 620.2.3])===		===620.12.2.3 Inspection ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=9 Sec 620.2.3])===

	Permanent pavement marking should be inspected following installation. Final measurements for retroreflectivity ~~are not to~~ be ~~done within the first~~ 14 days~~, but~~ no later than 45 days ~~after application~~. ~~Waiting~~ 14 days ~~ensures~~ that ~~all excess glass spheres have been removed~~ and ~~allows retesting~~ of the ~~pavement marking within~~ 45 days if the ~~measurements are challenged~~.		Permanent pavement marking should be inspected following installation. Final measurements for retroreflectivity should be taken no sooner than 14 days from placement of the pavement markings and no later than 45 days following placement. It is important to wait 14 days to allow traffic to remove excess beads that are not embedded into the paint and to wear off any paint film that may be on the surface of the embedded beads. Measurements taken in this timeframe (14-45 days) generally results in the most favorable initial readings as long as the contractor avoids tracking mud, tack or other debris onto the pavement markings.

	Retroreflectivity testing should be when pavement markings are dry and no visible moisture is on the road surface. Fog and condensation of morning dew should not be considered as acceptable weather conditions. Testing should not be done immediately after snow events. Testing should be done after salt from snow removal operations is washed away by rain. Retroreflectivity testing should be done during daytime hours only.		Retroreflectivity testing should be conducted when pavement markings are dry and no visible moisture is on the road surface. Fog and condensation of morning dew should not be considered as acceptable weather conditions. Testing should not be done immediately after snow events. Testing should be done after salt from snow removal operations is washed away by rain. Retroreflectivity testing should be done during daytime hours only.

	For construction projects 0.5 mi. or shorter, portable handheld retroreflectometers, such as the Mirolux 30 retroreflectometer, should be used in lieu of a mobile retroreflectometer to take retroreflectivity readings on permanent pavement marking. Measurements should be made in accordance with [[:media:620.10 MoDOT T80.pdf\|MoDOT Test Method TM 80]]. All measurements should be made in the direction of traffic flow, except on the centerline of two-lane roads where the required number of measurements should be made in each direction. Both single and double lines are to be measured, and the acceptance criteria should be applied for each line in both directions. Inspectors should realize that the Mirolux 30 machine normally shoots a beam of light approximately 6 to 12 inches. in front of the machine's lens. Therefore, the lens should be located approximately 6 to 12 in. from the flat area of rumble stripes. When the light falls in the bottom of the rumble, the retroreflectivity readings are usually lower than the backside or top of the rumble area because of the change of light beam angle, and for that reason, care should be taken to avoid taking readings in the bottom of the rumble. If handheld retroreflectometer results are disputed by the contractor, a mobile retroreflectometer may be requested for dispute resolution.		For construction projects 0.5 mi. or shorter, portable handheld retroreflectometers, such as the Mirolux 30 retroreflectometer, should be used in lieu of a mobile retroreflectometer to take retroreflectivity readings on permanent and temporary pavement marking. Measurements should be made in accordance with [[:media:620.10 MoDOT T80.pdf\|MoDOT Test Method TM 80]]. All measurements should be made in the direction of traffic flow, except on the centerline of two-lane roads where the required number of measurements should be made in each direction. Both single and double lines are to be measured, and the acceptance criteria should be applied for each line in both directions. Inspectors should realize that the Mirolux 30 machine normally shoots a beam of light approximately 6 to 12 inches. in front of the machine's lens. Therefore, the lens should be located approximately 6 to 12 in. from the flat area of rumble stripes. When the light falls in the bottom of the rumble, the retroreflectivity readings are usually lower than the backside or top of the rumble area because of the change of light beam angle, and for that reason, care should be taken to avoid taking readings in the bottom of the rumble. If handheld retroreflectometer results are disputed by the contractor, a mobile retroreflectometer may be requested for dispute resolution.

	For construction projects longer than 0.5 mi., a mobile retroreflectometer should be used. Mobile retroreflectivity readings are taken by a third party contractor hired by MoDOT. To provide the third party contractor with the required information for taking the readings, the [[:media:620.10 Third Party Retroreflectivity Request June 2012.xls\|Third Party Retroreflectivity Request]] form should be completed and sent to the Construction and Materials Division as soon as the markings are placed.		For construction projects longer than 0.5 mi., a mobile retroreflectometer should be used. Mobile retroreflectivity readings are taken by a third party contractor hired by MoDOT. To provide the third party contractor with the required information for taking the readings, the [[:media:620.10 Third Party Retroreflectivity Request June 2012.xls\|Third Party Retroreflectivity Request]] form should be completed and sent to the Construction and Materials Division as soon as the markings are placed.