Driver Awareness of Highway Sites with High Skid Accident Potential
This field study examined driver responses to two types of potential highway skidding hazard: wet pavements subjected to high frictional driving demands, and bridges during periods of possible preferential icing. Study objectives were to examine motorists' general awareness of the hazards and to assess the relative effectiveness of various signing treatments which warn of the hazards. Measures of signing effectiveness were motorists' speeds at critical driving locations and questionnaire responses regarding motorists' observations and interpretations of the signs. Three curved highway sections were treated with five experimental signing conditions. Experimental signing conditions incorporating flashing lights were effective at reducing highest quartile mean speeds below the critical safe wet pavement speed based on roadway geometry and surface conditions. Two bridge approaches were signed using combinations of activated and nonactivated signs both at the bridge and in advance of the bridge during periods of possible preferential icing.
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Figure Page 1 Reduced Skid Resistance as a Function of Traffic Volume
The Effect of Water on Tirepavement Friction as a Function of Speed
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activated signing advance location advisory speed limit assess Charlottesville conspicuity signing curve location data collection daylight deceleration displayed driver characteristics driving speed experimental signing familiar motorists Figure ﬂashing beacons friction g-force Glauz high conspicuity high self-testers higher level signing highest quartile speed highway agencies Highway Research Board hours of darkness Ice on Bridge icy bridge warning indicated inﬂuence INTERVEHICLE interviewed motorists lane liability low self-testers lower speeds mean speeds measure ministudies nonactivated signing obtained pavement data pavement wetting percent potential skid hazard quartile motorists questionnaire rainfall roadway safe wet sample signing conditions signing effects signing schemes skid resistance skidding accidents slippery Slippery When Wet Slow When Wet specificity signing speed data speed differences speed reductions speed zone studded tires switch pair Table tapeswitch test signs Texas Transportation Institute tight curvature tion tires traffic signs variables vehicle speeds wet pavement conditions