An Analytical Model for Predicting Cross-Country Vehicle Performance. Appendix E: Quantification of the Screening Effects of Vegatation on Driver's Vision and Vehicle Speed.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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A total of 39 tests were conducted with two wheeled and two tracked vehicles at three sites at Eglin AFB, Fla., and five sites at Khon Kaen, Thailand, in an effort to establish procedures for quantifying screening effects of vegatation on drivers vision and to relate recognition distance to maximum safe speed. Recognition distance was defined in this study as that distance wherein 76 percent of the dots painted on a standard target could be counted in a vegetation assemblage. Predictions of maximum safe speeds were computed based on recognition distance, and average deviation of predicted maximum safe speed from actual average speed for each test was 3.3 mph on the safe side. It is recommended that additional testing be done to develop a less tedious and time-consuming procedure for determining recognition distance in vegetated areas and that stopping distance-soil strength relations be established. Author
- Personnel Management and Labor Relations
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