QUANTIFYING THE BENEFITS OF VARIABLE REFLECTANCE REARVIEW MIRRORS
Photometric data were collected on the simultaneous levels of rearview mirror glare and luminance of the forward scene, in order to characterize the night driving environment for rearview mirrors. An instrumented vehicle was used to collect photometric data for each combination of three road types (urban, expressway, and rural) with two pavement conditions (dry and wet). These data were then used to quantify the benefits of variable-reflectance rearview mirrors relative to 1) fixed-reflectance mirrors, and 2) two-level prism mirrors. The performance of the various types of mirrors was quantified in terms of a figure of merit. The figure of merit is simply the percentage of the time that all of three mirror-performance measures are met: 1) discomfort glare; 2) forward visibility; and 3) rearward visibility. Results of the model indicate that variable reflectance mirrors offer substantial improvements, both as replacements for prism mirrors in the center mirror position and as replacements for fixed reflectance driver-side mirrors. The advantages are present in approximately equal magnitudes for most combinations of road type and pavement condition.
- See also PB93-146223. Sponsored by Ichikoh Industries, Ltd., Tokyo, Japan.
University of Michigan Transportation Research Institute2901 Baxter Road
Ann Arbor, MI United States 48109-2150
- Flannagan, M J
- Sivak, M
- Publication Date: 1994-1
- Pagination: 26 p.
- TRT Terms: Automobile driving; Dryness; Expressways; Glare; Luminance; Moisture content; Night; Performance evaluations; Photometry; Rearview mirrors; Reflectivity; Rural highways; Urban highways
- Uncontrolled Terms: Dry conditions; Night driving; Reflectance; Wet conditions
- Subject Areas: Highways; Vehicles and Equipment; I91: Vehicle Design and Safety;
- Accession Number: 00669205
- Record Type: Publication
- Report/Paper Numbers: UMTRI-94-02, HS-041 408
- Files: HSL, TRIS
- Created Date: Nov 30 1994 12:00AM