Retroreflective Requirements for Traffic Signs - A STOP Sign Case Study
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

For very narrow results

When looking for a specific result

Best used for discovery & interchangable words

Recommended to be used in conjunction with other fields

Dates

to

Document Data
Library
People
Clear All
Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Retroreflective Requirements for Traffic Signs - A STOP Sign Case Study

Filetype[PDF-2.50 MB]


English

Details:

  • Creators:
  • Corporate Creators:
  • Subject/TRT Terms:
  • Publication/ Report Number:
  • Resource Type:
  • Right Statement:
  • Geographical Coverage:
  • Edition:
    Final Report
  • Corporate Publisher:
  • Abstract:
    Poor sign reflectivity is a contributor to the high proportion of nighttime accidents. At night, signs must have enough brightness to allow a driver to recognize and react to the intended message of the sign in a safe manner. Failure to recognize a regulatory sign, such as a STOP sign, could result in a severe accident. The Manual on Uniform Traffic Control Devices (MUTCD) contains no standards on minimum initial or maintained retroreflectivity for traffic signs. However, the Federal Highway Administration, through the Federal Register, is considering comments to determine whether to establish minimum retroreflectivity standards for in-service traffic signs. This study determined the performance of STOP signs based on their retroreflective properties. Thirty-five 30-inch STOP signs, including engineering grade and high intensity, were measured in the laboratory to determine their retroreflective properties. A subset of ten signs was taken to the field to determine how far they could be recognized by paid subjects. Mathematical relationships between the various retroreflective properties and recognition distance were developed. The overall specific intensity per unit area (SIA) was found to be a good measure for estimating the recognition distance of STOP signs. By computing the minimum sign viewing distance for various approach speeds, the required integrated SIA of STOP signs was found. Findings from this study will (1) aid in establishing minimum in-service levels of retroreflectivity for STOP signs, (2) assist field personnel to determine whether a particular STOP sign is providing the desired recognition distance of whether it should be replaced, and (3) give an insight to the feasibility of creating a minimum in-service retroreflective standards for other types of traffic signs.
  • Format:
  • Collection(s):
  • Main Document Checksum:
  • Download URL:
  • File Type:

Supporting Files

  • No Additional Files
More +

You May Also Like

Checkout today's featured content at rosap.ntl.bts.gov