Minimum sign retroreflective guidelines : summary report

Details

• Corporate Creators:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Retroreflectivity
  • Traffic control devices
  • Traffic signs
  • Night visibility
  • Guidelines
  • Human factors
  • Economic factors
  • Field studies
  • Mathematical models
  • Manual on Uniform Traffic Control Devices
• Publication/ Report Number:
  FHWA-RD-97-074
• Resource Type:
  Manual
• Geographical Coverage:
  United States
• Corporate Publisher:
  United States. Federal Highway Administration
• Abstract:
  Retroreflective traffic control devices are designed to help offset the lack of visual cues in the nighttime driving environment. Currently, the Manual on Uniform Traffic Control Devices requires that signs be retroreflectorized, but no minimum in-service values are given for the level of retroreflectivity. Due to the degradation of retroreflective materials over the course of years, it is important to have a basis for knowing when to replace signs. A two-phased approach was taken in defining minimum retroreflectivity values for signs. Human factors requirements were considered, as well as economic implications in setting replacement values. This summary report describes the Federal Highway Administration's Computerized Analysis of Retroreflective Traffic Sign (CARTS) model and its use in developing proposed minimum sign retroreflectivity guideline values. Also described are a laboratory study and field evaluation of the values.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/3640/dot_3640_DS1.pdf
• File Type:
  [PDF - 121.94 KB]
• Collection(s):
  ITSJPO Digital Library ; Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:ce3a267ad309274c5f9497a5ea969e64a0f243e3010f4786dc8201440186e7b450fbc0c14f918c39b90aea9edc6f8c27370ee7933afe28ef7689bebbb1d3117a