00206953

Component

https://onlinepubs.trb.or...RBbulletin/186/186-002.pdf

THE SKID PERFORMANCE OF SEVERAL MAKES OF TIRES ON CLEAN, DRY, LEVEL ROAD SURFACES WAS INVESTIGATED. FACTORS CONSIDERED INCLUDED SKIDDING VELOCITY, TIRE MAKE, WHEEL LOADING, AND TYPE OF ROAD SURFACE. DATA WERE OBTAINED FROM TRAILER DRAG TESTS AND PANIC STOPS OF PASSENGER VEHICLES. TESTS WERE PERFORMED USING TIRES OF FOUR DIFFERENT MAKES, THREE DIFFERENT ROAD SURFACES, AND SEVERAL DIFFERENT WHEEL LOADINGS. FOR THE DRAG TESTS, SKIDDING SPEEDS WERE FROM 10 MPH TO 50 MPH. PANIC STOPS WITH PASSENGER VEHICLES WERE MADE FROM SPEEDS OF 30, 40, 50, AND 70 MPH. IT WAS FOUND THAT AMONG DIFFERENT MAKES OF TIRES OF COMPARABLE QUALITY THERE EXISTED DIFFERENCES IN STOPPING ABILITY. DIFFERENCES IN THE LENGTH OF SKID AND BRAKING DISTANCE FOR A GIVEN INITIAL SPEED AND ROAD SURFACE TYPE WERE FOUND TO BE ABOUT TEN PERCENT FOR THE FOUR MAKES OF TIRES TESTED. SIMILAR DIFFERENCES WERE FOUND ON OTHER ROAD SURFACES. ONE OF THE MOST SIGNIFICANT FINDINGS WAS THAT THE COEFFICIENT OF FRICTION DEVELOPED BETWEEN A GIVEN TIRE AND ROAD WAS FOUND TO BE GREATER AT THE HIGHER SPEEDS. THIS TREND HAS NOT BEEN REPORTED BY OTHER INVESTIGATORS TO THE AUTHOR'S KNOWLEDGE. THE IMPLICATION OF THIS FINDING IS THAT EXISTING METHODS OF ESTIMATING PRIOR SPEED FROM LENGTH OF SKID MARKS LAID DOWN IN AN ACCIDENT INVARIABLY GIVES A CONSERVATIVE ESTIMATE OF SPEED. FOR A CAREFULLY EXECUTED EXPERIMENT, SPEED ESTIMATES WILL BE ACCURATE TO WITHIN FIVE PERCENT. /AUTHOR/

No 186, pp 8-25, 10 FIG, 11 TAB, 8 PHOT, 6 REF, 6 APP. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01410582

1958

Highway Research Board Bulletin

Digital/other

Automobiles; Canal lock operations; Coefficient of friction; Pavement performance; Pavements; Skid resistance; Skidding; Speed; Stopping distances; Surface course (Pavements); Tires; Velocity; Wheel loads

Highways; Pavements; Safety and Human Factors; Vehicles and Equipment

TRIS, TRB

Oct 14 1994 12:00AM

• A DEVICE FOR DETERMINING RELATIVE POTENTIAL SLIPPERINESS OF PAVEMENT MIXTURES
• A STUDY OF THE POLISHING CHARACTERISTICS OF LIMESTONE AND SANDSTONE AGGREGATES IN REGARD TO PAVEMENT SLIPPERINESS
• MEASUREMENT OF PAVEMENT SKIDDING RESISTANCE BY MEANS OF A SIMPLE 2-WHEEL TRAILER
• MICHIGAN'S SKID TESTING PROGRAM
• SUPPLEMENTAL PAVEMENT SKIDDING RESISTANCE TESTS IN VIRGINIA
• SUPPLEMENTAL TESTS OF PAVEMENT SKIDDING RESISTANCE WITH A 3-WHEEL TRAILER
• TEST FOR COEFFICIENTS OF FRICTION BY THE SKIDDING CAR METHOD ON WET AND DRY SURFACES