459 ALASKA 2020 SECT ION 670
670-1.01 DESCRIPTION. Furnish and place traffic markings of the type, color, dimensions, and
at the locations shown on the Plans. Meet these specifications and the applicable portions of the Alaska Traffic Manual.
670-2.01 MATERIA LS. Use materials that conform to the following:
Traffic Paint Subsection 708- 2.03 Glass Beads Subsection 712- 2.08 Preformed Pavement Markings Subsection 712- 2.14 Raised and Recessed Pavement Markers Subsection 712- 2.15 Methyl Methacrylate Pavement Mark ings Subsection 712- 2.17 Glass Beads for Methyl Methacrylate Markings Subsection 712-2.18 Construct the iron casting for the raised pavement markers of modular iron meeting ASTM A536. Submit a manufacturer certification for both the Methyl Methacrylate mat erial and glass beads to certify that the materials furnished conform to these Specifications.
670-3.01 CONSTRUCTIO N REQUIREMENTS. Install interim pavement markings meeting
Section 643 if permanent markings are not installed prior to opening the roadway to traffic.
1.Paint.
a.Apply paint only to pavements that are clean, dry, and warmer than 40 °F.
b.Remove all dirt, oil, grease, and other foreign matter from the surfaces to be painted in a satisfactory manner.
c.Apply the paint at the rate of 80 ft2/gal (approximately 20 mils wet film thickness). This rate is effectively 22 gallons of paint per mile of solid 4- inch stripe. A tolerance not to exceed 10 percent is allowed for film thickness or yield.
d.Apply glass beads over the wet painted stripes in a uniform pattern at the rate of 6 pounds ( ± 0.1 pound) of beads per gallon of paint. Pressure- apply the beads using a mechanical dispenser mounted not more than 12 inches behind the paint dispenser.
e.Use approved equipment for highway lane striping that is specifically des igned and manufactured for that purpose by a company experienced in the design and manufacture of such equipment. Minimum requirements include the capability of striping two 4- inch yellow centerlines and one 4- inch white edge line simultaneously. Apply mar kings with clear -cut edges, true and smooth alignment, and uniform film thickness.
2.Preformed Marking Tapes (PMT). Apply the PMT material as directed by the manufacturer by either the inlay or overlay method. Use the inlay method whenever new asphalt concrete is placed. Use the overlay method to apply markings to existing pavement. Store all PMT materials between 60 °F and 85 °F for at least 24 hours prior to installation. During installation, maintain field stockpiles at the required storage temperature. For the inlay method, embed the pavement markings in the asphalt concrete surface with a conventional steel wheeled roller. Apply when the surface temperature of the mat is the warmest possible without deforming the marking. The minimum allowable surface temperature, taken within 3/8 inch of the top of the mat, is 140 °F. 460 ALASKA 2020 If the application of the PMT materials falls behind the paving operation to the extent that the markings are not being applied at the minimum acceptable temperature, slow the paving operati on to match the rate of the marking laydown. Resume full paving operations after demonstrating that you have sufficiently skilled personnel to install the markings within the required temperature limits. When applying pavement markings by the overlay metho d, ensure the surface is clean and dry and is at least 60 °F and rising. Broom the surface clean. Remove any dust using compressed air. Apply a coat of primer/adhesive activator according to the manufacturer’s recommendations. Install and roll the markings with a minimum 200- pound pneumatic roller.
3.Raised and Recessed Pavement Markers. Install raised and recessed pavement markers per the manufacturer’s instructions. Cut or dado the finished pavement surface with a concrete saw to produce a slot with dimensi ons as shown on the Plans or recommended by the manufacturer. Clean and dry the slots using compressed air. Install a reflective marker of the color indicated with an epoxy adhesive recommended by the marker manufacturer.
4.Methyl Methacrylate Pavement Marki ngs.
a.General. Provide installation instructions for the methyl methacrylate markings a minimum of 15 days prior to application. Retain a copy of the instructions for use on the project. Ensure the on- site presence of a manufacturer's representative on the first day of striping and any additional days as required.
b.Preparation. Prepare the roadway areas to receive methyl methacrylate pavement markings according to the manufacturer's recommendations. Clean and dry roadway surface. Remove contaminants such as curing agents, surface oils, or existing road marking materials prior to applying pavement marking material. Do not apply marking to new asphalt until the asphalt has cured for at least 15 days.
c.Application. Apply methyl methacrylate marking material according to the manufacturer's installation instructions and the recommendations of the manufacturer's representative. Use equipment designed and capable of properly mixing at the point and time of application.
1.Longitudinal Markings. Apply markings for lane l ines, edge lines, and centerlines at a thickness of 60 ± 5 mils. Apply glass beads at the drop rate specified in Subsection
712-2.18 by double bead gun, one gun directly in front of the spray unit and another
directly behind.
2.Transverse Markings. Apply ma rkings for crosswalks, stop bars, symbols, transverse markings between gore and channelization striping, and legend markings at a thickness of 120 ± 5 mils. Apply Sinker beads as specified in Subsection 712- 2.18 at a minimum drop rate of 1 lb/yd2.
d.Sampling . Collect a representative sample of spray material by placing a flat sheet of aluminum in the path of the striping guns. Collect the sample without glass beads. Measure the thickness of the sample without glass beads utilizing a wet film thickness gage.
670-3.04 PAVEMENT MAR KING REMOVAL. Remove all existing traffic markings that are in
conflict with the striping details shown on the Plans, an approved TCP, or any temporary striping as directed. Do not paint over existing markings. Do not use open flame on the final paving lift. 461 ALASKA 2020 Remove pavement markings to the fullest extent possible without materially damaging the pavement surface, color, or texture. As the work progresses, remove sand or other material deposited on the pavement as a result of removing mark ings. Remove accumulations of sand or other material that might interfere with drainage or constitute a hazard to traffic. Before making any change in the traffic pattern, remove or obliterate pavement markings that may create confusion to motorists. Where using blast cleaning to remove pavement markings or objectionable material within 10 feet of a lane occupied by public traffic, immediately remove the residue (including dust) after contact between the sand and the surface being treated. For such removal, use a vacuum attachment operating concurrently with the blast cleaning operation or by other approved methods. Repair any damaged pavement or surfacing caused by the pavement marking removal operation.
670-3.05 PRELIMINARY SPOTTING. Provide the necessary control points at intervals including
all changes of direction and changes in the basic configuration of striping, such as at the beginning and ending of no- passing zones on a 2- way, 2 -lane roadway. Use these points in preliminary spotting of lines before striping is commenced. Perform preliminary spotting of the lines to be painted and obtain approval for all spotting before striping begins. Preliminary spotting is required for all longitudinal striping, with spacing of spots not to exceed 50 feet. Reference the lines and markings to be replaced at their existing locations prior to performing any work that may disturb them.
670-3.06 Tolerances for Lane Striping.
1.Length of Stripe . ±6 inches in 40 feet
2.Width of Stripe. ±1/4 inch
3.Lane Width. ±4 inches from the widths shown on the Plans (measured from the edge of pavement or edge of traveled way to center of lane line or between the centers of adjacent lane lines)
4.Stripes on Tangent . Do not vary more than 1 inch laterally within a distance of 100 feet when using the edge of the stripe as a reference.
5.Stripes on Curves . Uniform in alignment with no apparent deviations from the true curvature
6.All Stripes . Keep the center of the stripe within 4 inches from the planned alignment. Traffic markings not within the abov e tolerances are unacceptable under Subsection 105- 1.11.
670-4.01 METHOD OF M EASUREMENT. See Section 109 and the following:
1.Mile Basis . By the horizontal distance along centerline from beginning to end of each stripe pattern, excluding gaps for intersecti ons or other openings. Skip stripes will be measured as 1/4 of this distance.
a.Single Stripe : A longitudinal marking less than 6 inches wide, such as, but not limited to, a single center line or edge stripe.
b.Double or Wide Stripe : A longitudinal marking gr eater than 6 inches wide, such as, but not limited to, double center lines, and auxiliary lane lines. 462 ALASKA 2020 2. Square Foot Basis . Transverse pavement marking lines 6 inches or more wide will be measured by nominal width times actual length.
3.Each . All other transverse markings will be measured on a unit basis with each separate word or symbol constituting a unit. Raised or recessed pavement markers will be measured per each unit installed complete.
4.Linear Foot . A single lineal measurement for every measured foot of stripe from beginning to end of each stripe pattern, excluding gaps for intersections or other openings. Skip stripes will be measured as 1/4 of this distance.
a.Single Stripe : A longitudinal marking less than 6 inches wide, such as, but not limited to, a single center line or edge stripe.
b.Double or Wide Stripe : A longitudinal marking greater than 6 inches wide, such as, but not limited to, double center lines, and auxiliary lane lines.
670-5.01 BASIS OF PA YMENT. At the contract price per unit of measurement for those items
listed below that appear on the bid schedule. Accept payment as full compensation for cleaning of pavement, painting traffic markings, application of preformed pavement markings, glass beads, installing raised or recessed pavement markers , furnishing paint, glass beads, preformed marking tape and all other materials necessary to complete the work prescribed in this Section. When Items 670.0009. ____ , 670.0014. ____ , or 670.0015. ____ , and 670.0016. ____ are not shown on the bid schedule, removal of pavement markings is subsidiary to other items of work. For traffic markings which do not conform to the requirements of this Section but which are allowed to remain in place, payment will be adjusted as follows:
1.Lump Sum . When payment is on a lump sum basis the price reduction will be the product of the lump sum price times the length of non- conforming markings divided by the total length of markings. For the purpose of this calculation, stripe lengths will be considered as continuous with no deduct ion for skips or breaks, for each 4- inch width stripe being applied, except that a double centerline stripe (No Pass) will be considered as one stripe.
2.Unit Prices . When payment is on a unit price basis, no payment will be made for those units which are not in conformance. Payment will be made under: PAY ITEM Item Number Item Description Unit 670.0001.____ Painted Traffic Markings LS 670.0002.____ Single Stripe MILE 670.0003.____ Double or Wide Stripe MILE 670.0004.____ Transverse Pavement Marking Lin es SF 670.0005.____ Transverse Markings, Words and Symbols EACH 670.0006.____ Preformed Pavement Markings LS 670.0007.____ Raised Pavement Marker EACH 670.0008.____ Recessed Pavement Marker EACH 670.0009.____ Removal of Pavement Markings MILE 670.001 0.____ Methyl Methacrylate Pavement Markings LS 670.0011.____ Methyl Methacrylate Transverse Pavement Marking Lines SF 463 ALASKA 2020 PAY ITEM Item Number Item Description Unit 670.0012.____ Methyl Methacrylate Transverse Markings, Words and Symbols EACH 670.0013.____ Painted Traffic Markings LF 670.0014.____ Removal of Pavement Markings LS 670.0015.____ Removal of Pavement Markings SF 670.0016.____ Removal of Pavement Marking Symbols EACH 464 ALASKA 2020 SECTION 681 FUEL TANK (RESERVED)
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 487–491 of 584.