REPORT BY TECHNICAL COMMITTEE ON SLIPPERINESS

MACHINES FOR MEASURING THE SLIPPERINESS OF ROADS ARE REVIEWED IN THE FOLLOWING COUNTRIES: GERMANY, GREAT BRITAIN, BELGIUM, FRANCE, NETHERLANDS, POLAND, SWEDEN, AND SWITZERLAND. WITH THE INCREASING SPEED OF VEHICLES, PROBLEMS OF SKIDDING RESISTANCE AT HIGH SPEEDS ARE ASSUMING MUCH GREATER IMMPORTANCE. RESULTS ARE DISCUSSED OF THE CORRELATION TEST CONDUCTED AT TAPPAHANNOCK, VIRGINIA. DETAILS ARE GIVEN ON LOCKED WHEEL BRAKING TESTS. THE SURFACE TEXTURE OF ROADS AND THE PATTERN AND RESILIENCE OF PROPERTIES OF TIRE TREADS ARE DISCUSSED. THE TASK OF STANDARDIZING TEST CONDITIONS IN TIRE TREAD COMPOSITION AND PROPERTIES APPEARS VERY DIFFICULT. THE DEVELOPMENT OF STUDDED TIRES PRESENTS AN IMPORTANT NEW APPROACH TO THE PROBLEM OF DEALING WITH SLIPPERINESS ON ROADS COVERED WITH ICE AND SNOW. HIGH SPEED STUDIES TEND TO EMPHASIZE THE NUMERICAL DIFFERENCE IN COEFFICIENT VALUES OBTAINED WITH THE SIDE-SLIPPING WHEEL, A LOCKED WHEEL AND A WHEEL BRAKE TO GIVE THE PEAK COEFFICIENT VALUE. HIGH SPEED INVESTIGATIONS HAVE ALSO SHOWN THE IMPORTANT EFFECT OF THE THICKNESS OF WATER FILM ON FRICTION VALUES AT HIGH SPEED. THE QUESTION OF WATER DEPTH COMES INTO PROMINENCE WITH THE PHENOMENA OF AQUAPLANING TO WHICH INCREASING ATTENTION IS BEING GIVEN.

• Supplemental Notes:
  • 90 Pp, 40 FIG, 5 TAB, 55 REF
• Publication Date: 1967

Media Info

• Serial:
  • Perm Intl Assoc Road Congresses Proc
  • Publisher: Xiiith Congress, Tokyo

Subject/Index Terms

• TRT Terms: Braking; Films (Coatings); Friction; Hydroplaning; Pavements; Skid resistance; Skid resistance tests; Skidding; Slipperiness; Studded tires; Surface course (Pavements); Texture; Tire treads; Tires; Water
• Old TRIS Terms: Water film
• Subject Areas: Highways; Pavements; Vehicles and Equipment;

Filing Info

• Accession Number: 00206684
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 12 1994 12:00AM