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Relationships Between Pre-Skidding and Pre-Braking Speed  

Ryu, Tae-Seon (도로교통공단 교통사고종합분석센터)
Jeon, Jin-U (서울시립대학교 교통공학과)
Park, Hong-Han (도로교통공단 교통사고종합분석센터)
Lee, Su-Beom (서울시립대학교 교통공학과)
Publication Information
Journal of Korean Society of Transportation / v.27, no.1, 2009 , pp. 43-51 More about this Journal
Abstract
This paper investigates the accuracy of vehicle pre-braking speed estimates based upon tire/roadway coefficient of friction (drag factor) measurements and skid mark measurements Data for pre-braking and pre-skidding speeds were collected to determine if there were any correlations between pre-braking speeds and pre-skidding speeds. Braking tests were performed on two vehicles using various measurement devices including a fifth wheel, a speed gun, and a vericom 2000. The vehicle speeds, braking distances, skid mark distances, and deceleration histories were recorded. From these data. coefficients of friction and vehicle pre-skidding speeds for the tested road surface were calculated. The pre-skidding speeds were then compared to the actual pre-braking speeds of the vehicles in order to establish relationships between pre-skidding and pre-braking speed. A correlation between the Pre-skidding speed and the actual pre-braking speed was established for the study data.
Keywords
Pre-braking speed; Pre-skidding speed; Tire/roadway coefficient of friction; skid mark; Braking test;
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