This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Revising the DETECT Seeing Distance Model
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1988 by SAE International in United States
Annotation ability available
This paper describes the algorithms that are being incorporated into a revised version of the DETECT seeing distance model. The revised model is being written in QuickBASIC for IBM-compatible personal computers. DETECT calculates the distances at which a driver can see various objects on the road at night as illuminated by the headlamp system specified by the user. The revised algorithms are based on professor Blackwell's recent contrast sensitivity research. They include new formulations for calculating contrast thresholds and for taking driver age, target size, background luminance and individual differences into account. The revised expression for disability glare also has a correction for driver age. The seeing distances calculated using the old and revised versions are generally in close correspondence. However, at low illumination levels, the new algorithm predicts seeing distances that are as much as 12% greater than the original version. These differences can be traced to differences in between the old and revised contrast threshold functions. The age and variability factors in the new algorithm have a substantial impact on seeing distances. Against a low beam glare source at 300 feet, the seeing distance for an average 20-year old is 210 feet while for a 15th percentile 70-year old it is 92 feet.
CitationFarber, E., "Revising the DETECT Seeing Distance Model," SAE Technical Paper 880716, 1988, https://doi.org/10.4271/880716.
- Bhise V. D. Farber E. I. McMahan P. B. Predicting target-detection distance with headlights Transportation Research Record 611 1976
- Blackwell H. R. Brightness discrimination data for the specification of quantity of illumination Illuminating Engineering XLVII 11 1952
- Blackwell O. M. Blackwell H. R. Visual performance data for 156 normal observers of various ages Journal of the IES October 1971
- Fry G. A. Evaluating disabling effects of approaching automobile headlights HRB Bulletin 89 1954
- Commission Internationale De L'Eclairage An analytic model for describing the influence of lighting parameters upon visual performance Publication CIE No. 19/2.1 1981
- Blackwell O. M. Blackwell H. R. Individual responses to lighting parameters for a population of 235 observers of various ages Journal of the IES July 1980