U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

Machine Vision Approach to Retroreflectivity Measurements

File Language:
English


Select the Download button to view the document
Please click the download button to view the document.

Details

  • Creators:
  • Corporate Creators:
    University of North Florida
  • Corporate Contributors:
    Florida. Department of Transportation
  • Subject/TRT Terms:
  • Publication/ Report Number:
    6
  • Resource Type:
    Tech Report
  • Geographical Coverage:
  • Edition:
    Final Report: January 2025 – December 2025
  • Corporate Publisher:
    Florida. Department of Transportation
  • Abstract:
    This report presents a complete evaluation of the machine-vision-based dynamic retroreflectometer system (DRS) with a 30-m geometry scaled to 12-m, manufactured by Reflective Measurement Systems Ltd, 100% owners of RetroTekUSA. The assessment includes pavement marking evaluation, including line striping retroreflectivity, line striping width, color and contrast, and raised pavement marker (RPM) detection/count, across the full lane width in a single pass. DRS performance is benchmarked against handheld devices, an FDOT mobile retroreflectivity unit (MRU) used by FDOT and validated against photometric range equipment. Six months of static and dynamic testing at the FDOT Gainesville facility demonstrated that the DRS provides high repeatability, low bias, and full lane-width coverage in a single pass for RL accuracy and operational efficiency. Static lab tests confirmed over 96% accuracy and coefficient of variation (COV) below 4% under varied lighting, background, and sample conditions. Field testing (up to 6-mi) showed stable RL measurements (100–800 mcd/m²/lux) and strong agreement with handheld reference devices though Contrast Ratio (CR) and RPM measurements were limited by ambient lighting and pavement conditions. Overall, the DRS represents a reliable, labor-saving tool for large-scale pavement marking evaluation, with future work focusing on algorithm refinement, reproducibility, and environmental effects to enhance actionable outputs particularly for RPM detection.
  • Format:
    PDF
  • Funding:
    BED33-977-03
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:68277bf48756a06d6c3e860bd3275194907d5e0e54d1f6fbe4159f0e4f32003057ef9804b63d4ca0fd4d4dad8436bae2c8e04dd5cf493e5f2b945d79ff1e7cb4
  • Download URL:
  • File Type:
    Filetype[PDF - 9.60 MB ]
PREVIOUS
File Language:
English
ON THIS PAGE
Details
ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP