A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluation of Raised Snowplowable Pavement Markers
In October 1977, over 200 Stimsonite Model 96 raised pavement markers were installed in New York State -- half in a moderate winter environment near Albany, and half in a severe winter environment near Syracuse. The markers did not survive one winter at Syracuse, but were performing acceptably after two winters near Albany. Tungsten carbide plow blades and leading-edge nose-shoes continue to be the main factors contributing to marker damage. Casting failures can be expected after 125 passes with a tungsten-carbide plow blade traveling at 20 to 35 mph. Reflector life is naturally limited by casting durability, but can be further shortened by use of the nose-shoes. Reflector visibility on these unlighted test areas was directly related to size of the reflective surface area. The corner-cube reflector used in the Model 96 can be expected to provide adequate visibility until it loses half of its original reflective surface area. Reflector replacement at this damage level should significantly increase visibility. However, a site can be most efficiently maintained by first evaluating the overall delineation provided, then focusing on the performance or damage levels of individual units. The markers will chip tungsten-carbide plow blades, but not significantly in small installations. Highway striping crews should have no difficulty avoiding properly placed markers.
Evaluation of Raised Snowplowable Pavement Markers
In October 1977, over 200 Stimsonite Model 96 raised pavement markers were installed in New York State -- half in a moderate winter environment near Albany, and half in a severe winter environment near Syracuse. The markers did not survive one winter at Syracuse, but were performing acceptably after two winters near Albany. Tungsten carbide plow blades and leading-edge nose-shoes continue to be the main factors contributing to marker damage. Casting failures can be expected after 125 passes with a tungsten-carbide plow blade traveling at 20 to 35 mph. Reflector life is naturally limited by casting durability, but can be further shortened by use of the nose-shoes. Reflector visibility on these unlighted test areas was directly related to size of the reflective surface area. The corner-cube reflector used in the Model 96 can be expected to provide adequate visibility until it loses half of its original reflective surface area. Reflector replacement at this damage level should significantly increase visibility. However, a site can be most efficiently maintained by first evaluating the overall delineation provided, then focusing on the performance or damage levels of individual units. The markers will chip tungsten-carbide plow blades, but not significantly in small installations. Highway striping crews should have no difficulty avoiding properly placed markers.
Evaluation of Raised Snowplowable Pavement Markers
G. F. Gurney (author) / P. K. Gupta (author) / W. G. Roth (author)
1980
50 pages
Report
No indication
English