Evaluation of the Impact of Spectral Power Distribution on Driver Performance

This project is a complete investigation of the impact of light-source spectrum on driver visual performance. In a series of human factors experiments, the effect of overhead lighting and headlamp spectral power distribution was evaluated with respect to driver detection and recognition of large and small objects and pedestrians. The potential for applying mesopic multiplying factors to roadway lighting was also evaluated, as was a momentary peripheral illuminator system’s effects on driver visual performance and eye-glance behavior. The results indicate that, although the momentary peripheral illuminator improved one measure of pedestrian detection, it was also a distraction to drivers. The results also indicate that at higher speeds, neither light-source spectrum nor mesopic multiplying factors apply, but mesopic multiplying factors are applicable to lighting design for lower-speed roadways and other nondriving environments.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: 240p

Subject/Index Terms

Filing Info

  • Accession Number: 01576250
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-HRT-15-047
  • Contract Numbers: DTFH61-10-C-00032
  • Files: TRIS, ATRI, USDOT
  • Created Date: Sep 9 2015 11:24AM