01124863

Component

This paper gives some preliminary results of a Land Transport New Zealand funded research project that is currently being undertaken in New Zealand to: (1) detect the presence of binder rise (flushing) from two-dimensional road surface profiles, and (2) quantify the influence of binder rise in reducing tire-road friction on surface dressing surfaces. Research indicates that there is a direct link between the risk of a crash in wet conditions and the level of skid resistance offered by a surface. By more accurately identifying flushed surfaces and quantifying the effects of binder rise in reducing skid resistance, skid resistance management practices can be improved thereby reducing the number of crashes in wet conditions. This paper discusses two objectives of the research: (1) establish whether or not the Dynamic Friction Tester can simulate high-speed Locked?Wheel Braking performance, and (2) quantify the friction reduction that occurs on flushed surfaces. The key finding is that surface dressing flushing reduces tire-road friction by approximately 0.1 units at 60km/h and reduces linearly with slip-speed at a rate of 0.01 per 20km/h.

01120148

09-2499

English

16p

2009

Transportation Research Board 88th Annual Meeting

DVD

Figures; Photos; References (16) ; Tables (3)

Binders; Braking performance; Friction; Pavement design; Pavement management systems; Rolling contact; Skid resistance

Locked wheel testers

New Zealand

Highways; Pavements; Safety and Human Factors; I22: Design of Pavements, Railways and Guideways

Transportation Research Board Annual Meeting 2009 Paper #09-2499

TRIS, TRB

Jan 30 2009 6:51PM