620Pavement Marking

620.10.2 3 Construction Requirements.

620.10.2 3.1 Temporary paint may be used as temporary pavement markings for the duration of the project.

Retroreflectivity shall be maintained as specified in Sec 620.40.2.2.4, at the contractor’s expense, for as long as the temporary pavement marking paint is in place.

620.10.2 3.2 The minimum thickness of the painted markings shall be no less than 18 mils. Lane lines, edge

lines and no-passing lines shall be 4 inches in width. Type P drop-on glass beads, in accordance with Sec

620.30 3, shall be used for temporary paint applications.

620.10.2 3.3 It is allowable to place a temporary paint line prior to cutting the rumble strip along that line. After

cutting the rumble, the remaining portion of the temporary paint line is considered sufficient temporary pavement marking until the permanent line can be placed.

620.10.2 3.4 When temporary pavement marking paint is used on the final driving surface, and durable

pavement marking is to be used for the permanent marking, all temporary paint shall be removed prior to applying the durable pavement marking. Removal will be at the contractor’s expense unless otherwise specified in the contract. Removal shall be in accordance with Sec 620.20.1.4.

620.10.2 3.5 When temporary pavement marking paint is used on the final driving surface and paint is to be

used for the permanent marking, all temporary paint shall be installed in the same location and in the same sequence as the final pavement marking such that no temporary pavement marking will be visible after the final pavement marking is installed. Any temporary pavement marking that remains visible after final pavement marking shall be removed at the contractor’s expense.

620.10.2 3.6 No-Passing Zones. When paint is used for temporary marking on two-lane, two-way roadways, all

no passing zone lines shall be marked prior to leaving the work zone unattended.

620.10.2 4 Equipment. All equipment for application of pavement marking paint shall be as specified in Sec

620.20.2 3.

620.10.3 Temporary Removable Pavement Marking Tape.

620.10.3 1 Description. This work shall consist of furnishing, placing and maintaining temporary removable

pavement marking tape at locations shown on the plans or as directed by the engineer.

620.10.3 2 Material. All material shall be in accordance with Division 1000, Material Details, and specifically

as follows: Item Section Temporary Removable Pavement Marking Tape1048.10.2

620.10.3 3 Construction Requirements. All temporary removable pavement marking tape within the project

limits shall be maintained by the contractor at the contractor’s expense in a manner approved by the engineer. All temporary removable marking tape shall be installed according to the manufacturer's recommendations.

620.10.4 Temporary Non-Removable Pavement Marking Tape.

620.10.4 1 Description. This work shall consist of furnishing, placing and maintaining temporary non-

removable pavement marking tape at locations shown on the plans or as directed by the engineer.

620.10.4 2 Material. All material shall be in accordance with Division 1000, Material Details, and specifically

as follows: Item Section Temporary Non-Removable Pavement Marking Tape1048.10.3

620.10.4 3 Construction Requirements. Temporary non-removable pavement marking tape shall be installed

according to the manufacturer's recommendations.

620.10.5 Temporary Raised Pavement Markers.

620.10.5 1 Description. This work shall consist of providing, installing, maintaining and removing

retroreflective temporary raised pavement markers (TRPMs) on roadway lane lines, centerlines or edge lines as shown on the plans or as directed by the engineer.

620.10.5 2 Material. All material shall be in accordance with Division 1000, Material Details, and specifically

as follows: Item Section Temporary Raised Pavement Markers1048.10.4

620.10.5 3 Construction Requirements.

620.10.5 3.1 TRPMs shall be of the colors shown on the plans unless otherwise directed by the engineer.

Reflective faces shall be oriented to face traffic. TRPMs shall be installed according to the manufacturer's recommendations and placed as shown in the plans.

620.10.5 3.2 TRPMs, with covers, shall be used for Seal Coat as defined in Sec 409 and for surface treatment

projects as defined in Sec 413 with the exception of Sec 413.30 and Sec 413.31.

620.10.5 3.3 On resurfacing projects, TRPMs shall be removed prior to placement of the next lift of asphalt.

TRPMs placed on final wearing surfaces shall be removed in their entirety after permanent striping is placed. No TRPMs, shall be left on Commission Right of Way.

620.10.6 Cold Weather Pavement Markings.

620.10.6 1 Description. Cold weather pavement marking paint is described as cold weather waterborne paint or

cold weather acrylic copolymer fast drying paint that is manufactured for use within the weather limitations specified herein.

620.10.6 2 Applications. Cold weather pavement marking paint may only be used for temporary pavement

marking or as a substitute for Class 1 pavement marking paint when approved by the engineer, at no additional cost to the Commission. Cold weather pavement marking paint shall not be used as a permanent pavement marking in lieu of Class 2 pavement marking paint or any durable pavement marking.

620.10.6 3 Weather Limitations. Cold weather paint shall not be used except when the ambient air temperature

and pavement surface temperature is greater than 35° F but less than 60° F. The pavement surface temperature and ambient air temperature shall be ascending from 35° F before striping operations begin. Cold weather pavement marking shall not be applied if the weather forecast for the eight hour period immediately following final application includes precipitation or temperatures below 35° F.

620.10.6 4 Material. Cold weather pavement marking paint and glass beads shall be in accordance with

620.10.6 5 Construction Requirements. Cold weather pavement marking paint shall be applied to a wet

thickness of no less than 18 mils. The mil thickness shall be increased as needed to account for the porosity of the pavement to achieve a target bead embedment of 60%. The wet film thickness of the applied paint may be tested with a paint thickness gauge as directed by the engineer. Type P drop-on glass beads, in accordance with Sec 620.30.3 shall be used for cold weather paint applications.

620.10.6 5.1 Paint may be heated before application to a maximum temperature of 120° F for waterborne paint

and 125° F for acrylic copolymer paint.

620.10.7 Method of Measurement. Final measurement of temporary pavement marking paint, temporary

removable tape, temporary non-removable tape and temporary raised pavement markers will not be made except for authorized changes during construction or where appreciable errors are found in the contract quantity. No measurement will be made for any temporary pavement markings, regardless of type, when used as temporary pavement marking due to obliteration of existing markings as defined in Sec 620.10.1.2.

620.10.7 1 Measurement of temporary pavement marking paint, temporary removable marking tape and

temporary non-removable marking tape, when required, will be measured per linear foot.

620.10.7 2 Measurement of Temporary Raised Pavement Markers (TRPMs), when required, will be measured

per each.

620.10.8 Basis of Payment.

620.10.8 1. The accepted quantity of temporary pavement marking paint, temporary removable tape, temporary

non-removable tape and temporary raised pavement markers will be paid for at the contract unit price for each of the pay items included in the contract. Payment will be made for initial installation only and not for repair or replacement.

620.10.8 2 No payment will be made for any temporary pavement markings, regardless of type, when used as

temporary pavement marking due to obliteration of existing markings as defined in Sec 620.10.1.2. SECTION 620.20 PERMANENT PAVEMENT MARKING.

620.20.1 General.

620.20.1 1 Quality Control and Quality Assurance. Quality Control and Quality Assurance shall be in

accordance with Sec 620.40.

620.20.1 2 When installing permanent pavement marking, the contractor shall match the pavement marking

sequence on the roadway just in advance of the project limits in order to provide a seamless and continuous marking from old to new pavement for future striping operations.

620.20.1 3 If the permanent pavement marking cannot be placed according to these specifications and the road

is to be opened to traffic with no permanent pavement marking in place, the contractor shall, at the direction of the engineer, place and maintain temporary pavement marking at the contractor’s expense. The contractor shall remove, collect and properly dispose of all temporary pavement marking and place the permanent pavement marking according to these specifications and as directed by the engineer.

620.20.1 4 Surface Preparation. The surface on which permanent pavement marking is to be placed shall be

clean, dry and free of all debris, laitance, curing compound and any other contaminants that may hinder the adhesion of the system to the surface. Permanent pavement marking shall not be applied in damp conditions or if there is any evidence of surface moisture on the pavement.

620.20.1 4.1 Prior to the installation of durable pavement markings, any pre-existing pavement markings shall

be removed to prepare the surface for the new application. Payment for the removal of pre-existing markings will be paid separately except when the pre-existing markings were placed by the contractor as temporary pavement markings.

620.20.1 5 Tolerance for Pavement Marking Lines.

620.20.2 Pavement Marking Paint.

620.20.2 1 Description. This work shall consist of furnishing and placing waterborne pavement marking paint

and drop-on glass beads in accordance with these specifications at locations shown on the plans or as directed by the engineer.

620.20.2 2 Material. Material for application of pavement marking paint shall be in accordance with Division

1000, Material Details, and specifically as follows: Item Section Drop-On Glass Beads 1048.30 High Build Acrylic Waterborne Pavement Marking Paint 1048.20.1.1

620.20.2 3 Construction Requirements.

620.20.2 3.1 All equipment shall be designed for pavement marking and shall be maintained in such a condition

to properly and evenly apply marking paint and drop-on glass beads per these specifications.

620.20.2 3.2 Paint shall be applied with self-propelled equipment using spray guns designed and adjusted to

apply paint at the required thickness and width. Finished markings shall have well-defined edges, uniform cross section thickness and uniform bead distribution across the surface of the line. If there is any evidence of gun clogging, splattering or uneven paint distribution, painting operations shall cease until equipment is restored to proper operation.

620.20.2 3.3 Waterborne paint shall not be heated above 120° F before application.

620.20.2 3.4 Waterborne paint shall only be used as specified in the contract and plans. Waterborne paint shall

not be used for stop lines, arrows, words and symbols.

620.20.2 4 Weather Limitations.

620.20.2 4.1 The pavement surface temperature and air temperature shall be determined by the contractor each

day prior to the pavement marking operation and at any other time deemed necessary by the engineer. Temperatures shall be obtained in accordance with MoDOT Test Method TM20.

620.20.2 4.2 For waterborne paint applications, the pavement surface temperature and ambient air temperatures

shall be above 50° F and rising before marking operations may begin. Waterborne paint shall not be applied if the forecast conditions for the eight hours immediately following final application include precipitation or temperatures below 50° F.

620.20.2 5 Class 1 Pavement Marking Paint. Class 1 pavement marking paint shall be applied to a wet

thickness of no less than 18 mils. The mil thickness shall be increased as needed to account for the porosity of the pavement and to achieve a target bead embedment of 60%. The wet film thickness of the applied paint shall be tested by the contractor with a paint thickness gauge or by other methods approved by the engineer.

620.20.2 5.1 Type P drop-on glass beads, in accordance with Sec 620.30, shall be used for Class 1 pavement

marking paint applications.

620.20.2 6 Class 2 Pavement Marking Paint. Class 2 pavement marking paint shall be applied to a wet

thickness of no less than 25 mils. The mil thickness shall be increased as needed to account for the porosity of the pavement and to achieve a target bead embedment of 60%. The wet film thickness of the applied paint shall be tested by the contractor with a paint thickness gauge or by other methods approved by the engineer.

620.20.2 6.1 Type L drop-on glass beads, in accordance with Sec 620.30, shall be used for Class 2 pavement

marking paint applications.

620.20.2 6.2 For open-graded pavement surfaces such as UBAWS Type B and C, it is allowable to apply a

primer coat of temporary paint prior to applying the Class 2 pavement marking paint. When a primer coat is used, it shall be applied in accordance with Sec 620.10.2 and shall be fully cured prior to application of the surface coat in accordance with the manufacturer’s recommendation or for a minimum of 12 hours, whichever is greater. No additional payment will be made for the primer coat except for locations where Temporary Pavement Marking Paint is provided in the contract.

620.20.3 Durable Pavement Markings

620.20.3 1 Durable Pavement Marking Lines.

620.20.3 1.1 Description. This work shall consist of furnishing and placing durable pavement marking lines in

accordance with manufacturer’s recommendations at locations shown on the plans or as directed by the engineer. Glass beads, when required, shall be in accordance with Sec 620.30.

620.20.3 1.2 Material. All material shall be in accordance with Division 1000, Material Details, and specifically

as follows: Item Section Durable Pavement Marking Materials1048.20.2 Drop-On Glass Beads 1048.30

620.20.3 1.3 Equipment. The application equipment shall have a system capable of applying the material per

manufacturer’s recommendations.

620.20.3 1.4 Weather Limitations. The pavement marking shall only be applied during dry weather and on dry

pavement surfaces. The pavement surface temperature and ambient air temperature shall be in accordance with the material manufacturer’s recommendations throughout the application and during the specified time for curing of the material.

620.20.3 2 Durable Intersection Pavement Markings.

620.20.3 2.1 Description. This work shall consist of furnishing and placing chevron and diagonal markings,

crosswalks, stop lines, arrows, words and symbols in accordance with the manufacturer’s recommendations at locations shown on the plans or as directed by the engineer. Glass beads, when required, shall be in accordance with Sec 620.30.

620.20.3 2.2 Material. All material shall be in accordance with Division 1000, Material Details, and as

specified in Sec 1048.20.2.3.

620.20.3 2.3 Construction Requirements.

620.20.3 2.3.1 Durable Intersection Pavement Markings shall be installed according to the manufacturer's

recommendations. Material used shall be from the MoDOT Qualified Products list available at MoDOT.org. A copy of the manufacturer’s installation instructions shall be provided to the engineer prior to the intersection pavement marking pre-activity meeting.

620.20.3 2.3.2 Intersection markings shall be installed in a groove when recommended by the material

manufacturer and at no additional cost to the Commission. Surface mounting is allowable when that option is listed in the manufacturer’s recommendations and the product is approved for surface mounting on MoDOT’s Qualified Products list.

620.20.3 2.3.3 Arrows, words and symbols shall be white and may be formed from one piece or multiple pieces

of preformed pavement marking material or a durable liquid marking method specifically designed for intersection marking.

620.20.3 2.4 Acceptance. Acceptance for durable intersection pavement markings shall be in accordance

with Sec 620.40.2.2.1, except that a night time visual inspection will be made in lieu of measurement of retroreflectivity. If, in the opinion of the engineer, the retroreflectivity appears to be unacceptable, measurement of retroreflectivity will be made per MoDOT Test Method TM 80 for each intersection marking.

620.20.4 Method of Measurement.

620.20.4 1 Final measurement of permanent pavement marking will not be made except for authorized changes

during construction or where appreciable errors are found in the contract quantity. The revision or correction will be computed and added to or deducted from the contract quantity.

620.20.4 2 Where required, measurement of 4-inch, 6-inch, 8-inch, 12-inch and 24-inch pavement marking will

be made to the nearest linear foot. Where intermittent lines are specified, deductions will be made for the gaps in pavement marking.

620.20.4 3 Where required, measurement of non-linear durable intersection markings will be made per each.

620.20.5 Basis of Payment.

620.20.5 1 The accepted quantity of permanent pavement marking lines and intersection markings will be paid

for at the contract unit price for each of the pay items included in the contract, except as specified in Sec

620.20.5 2.

620.20.5 2 Payment for permanent pavement marking lines shall be adjusted based on retroreflectivity

measurements per Sec 620.40.2.2.4. SECTION 620.30 DROP-0N GLASS BEADS

620.30.1 Drop-On Glass Bead Application. Drop-on glass beads shall be mechanically applied to the

pavement marking directly behind the material application guns. The glass beads shall be applied in a manner that prevents the glass bead from rolling and covering the surface of the glass bead with pavement marking material. The application shall result in approximately 60% embedment of the glass beads into the pavement marking. Glass beads shall be applied evenly and shall completely cover the painted area. If beads are not embedding properly all operations shall cease until corrective actions are made.

620.30.2 Material. All material shall be in accordance with Division 1000, Material Details, and as specified

in Sec 1048.30.

620.30.3 Type P Glass Beads. Type P glass beads shall be applied at a minimum application rate of 10 lbs. per

100 sq.ft. of surface area of pavement marking material.

620.30.4 Type L Glass Beads. Type L glass beads shall be applied at a minimum application rate of 15 lbs. per

100 sq.ft. of surface area of pavement marking material in order to achieve desired wet reflectivity characteristics.

620.30.5 Basis of Payment. No payment will be made for drop-on glass beads. The cost of providing and

placing glass beads is included in the cost of pavement marking paint and durable pavement marking.

620.40 Quality Control and Quality Assurance.

620.40.1 Quality Control. The contractor shall control and monitor the quality of the work for all temporary

and permanent pavement markings and removal.

620.40.1 1 QC for Temporary and Permanent Pavement Marking Paint. The contractor shall ensure paint

and bead applications meet all contract requirements by conducting quality control (QC) evaluations including, but not limited to, calibration of the paint and bead application guns for the predetermined striping speed before beginning pavement marking operations, periodic verification of wet mil thickness, periodic measurement of line width, monitoring of the bead application rate and visual inspections of the bead embedment, distribution and retention.

620.40.1 1.1 Initial QC evaluations shall be conducted at the start of each pavement marking operation each day

as well as at the start of marking on each type of pavement surface. Thereafter, periodic checks shall be conducted as needed to ensure quality work is maintained throughout the marking operation.

620.40.1 1.2 Air and surface temperatures shall be checked in accordance with Sec 620.20.2.4.1 at the start of

each day prior to beginning pavement marking operations.

620.40.1 2 QC for Durable Pavement Marking. All applicable QC measures in Sec 620.40.1.1 shall also

apply to durable pavement markings, as well as any additional QC measures included in the manufacturer’s recommendations.

620.40.1 3 QC for Temporary Raised Pavement Markers. Temporary raised pavement markers shall be

monitored and maintained in place as specified in the plans.

620.40.2 Quality Assurance. The engineer or designated representative will be responsible for monitoring the

work and quality control efforts of the contractor. Measurement of retroreflectivity of the pavement markings shall be done by the engineer.

620.40.2 1 Retroreflectivity. The engineer will measure the average retroreflectivity of pavement markings

with a 30-meter geometry mobile retroreflectometer for each 0.1 mile segment per line. At the engineer’s discretion, such as for small quantities of permanent pavement markings or for any quantity of temporary pavement marking, the engineer may use a hand held retroreflectometer in accordance with MoDOT Test Method TM 80 to measure retroreflectivity.

620.40.2 1.1 Measurement of retroreflectivity will not be done within the first fourteen (14) days following

completion of all pavement marking. The contractor is responsible for ensuring the pavement markings are clean and protected from damage prior to measurements being taken. Any failed retroreflectivity readings due to unclean pavement markings or for other surface damage shall not be grounds for dispute of the readings.

620.40.2 2 Acceptance.

620.40.2 2.1 Pavement marking will be evaluated by the engineer for acceptance following installation. The

engineer will notify the contractor of any pavement markings that fail to meet acceptance. Reasons for failure could include, but are not limited to, failed retroreflectivity readings, incorrect color, incorrect location, poor alignment, poor adherence to the pavement surface, insufficient thickness, width or length and insufficient bead embedment.

620.40.2 2.2. Once notified by the engineer of any failed permanent pavement markings, the contractor shall

repair or replace the failed areas within 30 days at no cost to the commission.

620.40.2 2.3 After acceptance of the permanent pavement markings by the engineer the contractor shall be

released from further performance responsibility except for latent defects.

620.40.2 2.4 Retroreflectivity (millicandelas/m2/lux) acceptance requirements and payment adjustments for

painted and durable lines shall be as follows and as defined herein: Class 1 Paint (Type P Beads) White Yellow % Payment ≥350 ≥275 105% 300-349 225-274 100% 270-299 196-224 80%a Class 2 Paint (Type L Beads) White Yellow % Payment ≥450 ≥350 105% 400-449 300-349 100% 300-399 225-299 80%a Durable Pavement Marking Lines (Type L Beads) White Yellow % Payment ≥450 ≥350 105% 400-449 300-349 100% 300-399 225-299 80%a Class 1/Class 2 Paint on Seal Coat Surfaces White Yellow % Payment ≥150 ≥150 100% Temporary Pavement Marking Paint White Yellow % Payment 275b 200b 100% ≥200c ≥175c Maintain aContractor has the option to accept this deduction or to correct and improve payment. bMinimum requirement for initial application of temporary paint. cTemporary paint shall be maintained to this level at the contractor’s expense until permanent marking is installed.

620.40.2 2.4.1 Paint markings that fail to meet acceptance requirements, including retroreflectivity readings,

shall be reapplied at the contractor’s expense. Durable markings that fail to meet acceptance requirements, including retroreflectivity readings, shall be removed and replaced at the contractor’s expense.

620.40.2 2.4.2 Payment Adjustment. After all 0.1 mile segment of permanent painted and durable pavement

marking lines have been completed, and corrected when necessary, to a level that meets or exceeds all acceptance criteria, payment adjustments will be applied to each 0.1 mile segment for final retroreflectivity readings in accordance with Sec 620.40.2.2.4.

620.40.2 2.4.2.1 When a subsequent measurement of retroreflectivity is necessary due to corrective work, and

the 30-meter geometry mobile retroreflectometer is needed to perform the subsequent measurement, the actual cost to the Commission to perform the subsequent measurement will be deducted from the payment made to the contractor for pavement marking. SECTION 620.50 PAVEMENT MARKING REMOVAL.

620.50.1 Description. This work shall consist of all necessary operations for removal of existing pavement

marking lines and intersection markings as shown on the plans or directed by the engineer.

620.50.2 Construction Requirements. All pavement marking designated for removal, regardless of the type of

existing marking, shall be completely removed to the satisfaction of the engineer with minimal damage to the pavement. No more than five percent of the existing marking shall remain upon completion of the work. The pavement surface shall not be left scarred to such an extent that, in the opinion of the engineer, the obliterated area is misleading to motorists. Any excess damage or scarring of the pavement shall be repaired at the contractor's expense.

620.50.3 Method of Measurement.

620.50.3 1 Final measurement will not be made, except for authorized changes, during construction or where

significant errors are found in the contract quantity. The revision or correction will be computed and added to or deducted from the contract quantity.

620.50.3 2 Where required, measurement for the removal of pavement markings will be made to the nearest

linear foot per 4-inches of width. For intermittent lines, deductions will be made for gaps in the removal. Measurement will not be made for removal of pavement marking within the limits of a bypass roadway or other roadway to be obliterated at the completion of the project. Measurement of symbols will be made per each.

620.50.4 Basis of Payment. The accepted quantity of pavement marking removal will be paid for at the contract

unit price for each of the pay items included in the contract. SECTION 620.60 CONTRAST PAVEMENT MARKINGS.

620.60.1 Description. This work shall consist of furnishing and installing black contrasting pavement marking

for white intermittent markings (skips), white dotted lines and white solid intersection lane lines on concrete surfaces, as further described in Sec 620.60.3.1.

620.60.2 Material. The black contrast marking shall be compatible with the white pavement marking material

specified in the plans.

620.60.3 Construction Requirements.

620.60.3 1 Contrast Pavement Marking is required on all concrete surfaces that have a continuous length of

1,000 feet or greater. This requirement applies to all new and existing concrete pavement and bridge decks, including cementitious overlays. The contrast markings shall be accomplished by placing the black pavement marking according to manufacturer’s recommendations.

620.60.3 2 The white marking shall be centered within the black marking such that there will be a 1.5-inch

border of black on both sides of the white marking. Tolerances for the width and length of the black and white markings shall be in accordance with Sec 620.20.1.5.

620.60.4 Basis of Payment. There will be no direct payment for Contrast Pavement Markings.