Committee D04 on Road and Paving Materials
New Proposed Standard for Pavement Marking to Reflect Changes
A proposed new standard will provide a practice for inspecting and evaluating the retroreflective properties of longitudinal non-intersection pavement markings. The proposed standard, WK15655, Practice for Inspection and Evaluation of the Retroreflectivity of Longitudinal Non-Intersection Pavement Markings, is being developed by Subcommittee D04.38 on Highway Traffic Control Materials, which is part of ASTM International Committee D04 on Road and Paving Materials.
According to Paul Carlson, Texas Transportation Institute, Texas A&M University, the proposed standard will replace D 6359, Specification for Minimum Retroreflectance of Newly Applied Pavement Marking Using Portable Hand-Operated Instruments, which was withdrawn in 2006.
“D 6359 was a great starting place and provided a common method for sampling pavement marking retroreflectivity to assess the quality versus a standard,” says Carlson, who is chair of Task Group D04.38.07 on Pavement Marking Retroreflectivity. “However, as the standard aged, three main issues were noted.” These issues were:
The proposed new standard, which will be used by owners and installers of pavement markings, addresses these issues. WK15655 can be applied to both new and in-service markings and there is no retroreflectivity set in the proposed standard. Instead, the user is required to set the standard retroreflectivity level per their own expectations and desires. “In addition, there is a three-step process for inspecting and evaluating pavement markings,” says Carlson. “Each step of the proposed practice provides more statistical confidence in the determination of the measured pavement marking retroreflectivity level.”
Participation in the continuing development of WK15655, particularly in the area of user expertise, is welcome.
Technical Information: Paul Carlson, Texas Transportation Institute, Texas A&M University, College Station, Texas
ASTM Staff: Daniel Smith