DEVELOPMENT AND EVALUATION OF RAISED TRAFFIC LANE MARKERS

THIS REPORT PRESENTS THE RESULTS OF INVESTIGATIONS FROM 1968-71 ON RAISED TRAFFIC LANE MARKERS. PREVIOUS WORK FROM 1953-68 IS BRIEFLY REVIEWED. THE EVALUATION COVERS THE DURABILITY OF BOTH REFLECTIVE MARKERS AND CERAMIC DAYTIME MARKERS, PARTICULARLY PERTAINING TO CLEANING AND WEARABILITY OF SURFACES AND LOSS OF AND LIFE REFLECTION. THE NEW MARKERS THAT WERE EVALUATED ARE: (1) REFLECTORIZED TAPE ENCASED BETWEEN TWO 4" GLASS BARS SHOWING GOOD INITIAL NIGHTTIME VISIBILITY; (2) CERAMIC DAYTIME MARKERS WITH A REFLECTIVE ELEMENT CONSISTING OF AN ENCASED REFLECTIVE TAPE DESIGNED TO GIVE CONTINOUS DAYTIME AND NIGHTTIME DELINEATION; (3) GLASS- DAMED UNIT ENCASED IN RUBBER BASE RESULTED IN GLASS BREAKAGE AND POOR NIGHTTIME DELINEATION; (4) REFLECTORIZED TAPE ENCASED BETWEEN TWO 4" PLASTIC BARS INDICATED 6 MONTH DURABILITY (5) METAL CASE WITH REPLACEABLE REFLECTORIZED ELEMENT DESIGNED SO THAT THE REFLECTIVE ELEMENT CAN BE REPLACED BECAME ENEFFECTIVE AS MARKER SINCE RECESSED AREAS WERE DIFFICULT TO CLEAN AND MAINTAIN; (6) EPOXY MARKERS WITH GLASS BEADS CAST-IN-PLACE RESULTED IN POOR PERFORMANCE, DAY AND NIGHT; (7) "LOW PROFILE" DAYTIME CERAMIC MARKER DESIGNED TO MINIMIZE TIRE IMPACT NOISE CAUSED BY LANE CHANGING FAILED TO HAVE THE STRENGTH OF HIGH-STRENGTH CERAMIC MARKER; (8) REFLECTORIZED UNIT CONSISTING OF AN EPOXY FILLED ACRYLIC SHELL PROVIDED GOOD DELINEATION FOR 2 YRS. UNTIL THE PLASTIC CASING BEGAN TO SEPARATE FROM THE EPOXY FILLER; (9) GLASS DAYTIME MARKER HAS LOWER REFLECTANCE AND TENDS TO UNDERGO SEVERE CRACKING; (10) PLASTIC MARKER WITH REPLACEABLE REFLECTIVE ELEMENTS AND CONTAINING NO FILLER FAILED TO REMAIN IN PLACE FOR EITHER THE REFLECTIVE ELEMENTS OR THE ADHESIVE PAD; AND (11) MODIFIED SNOWPLOW MARKER FOR USE IN SNOW FREE AREAS INDICATED THAT NIGHTTIME OBSERVATIONS SHOWED FROM FAIR TO GOOD DELINEATION.

• Supplemental Notes:
  • M&R NO. 635152
• Corporate Authors:

  California Division of Highways

  Materials and Research Department
  Sacramento, CA  United States  95819
• Authors:
  • Shelly, T L
  • Rooney, H A
  • Beede, B K
  • Chapman, B J
  • Maggenti, E
  • Page, J W
  • Ford, R W
• Publication Date: 1971-10

Media Info

• Features: Figures;
• Pagination: 49 p.

Subject/Index Terms

• TRT Terms: Raised separators; Reflective signs; Reflectorized materials; Road markings
• Old TRIS Terms: Reflector markers; Traffic marking
• Subject Areas: Geotechnology; Highways; Materials; Safety and Human Factors;

Filing Info

• Accession Number: 00217210
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 30 1972 12:00AM