00667676

Component

http://onlinepubs.trb.org...trr/1994/1435/1435-019.pdf

https://scholar.google.co...rico&publication_year=1994

The findings of a research project that was conducted to determine the amount of side friction demanded and provided for a range of roadway curvatures, vehicle speeds and types, and pavement surface conditions are described. Seven horizontal curves located on rural two-lane highways in Alberta as well as curves at the Calgary Police Service's Driver Training Facility were used as test sites. A three-axis accelerometer and a ball bank indicator were installed in seven test vehicles, including passenger cars, a half-ton pick-up, and a tandem-axle gravel truck. Lateral accelerations and ball bank readings were taken as the vehicles traversed test curves at constant speeds. Speeds were increased in increments of 10 km/hr until impending side skid conditions were reached. Ball bank readings are regressed upon lateral accelerations for each vehicle type, and equations predicting the implied value of safe side friction, the safe speed of the curve, and the margin of safety provided by the safe speed are developed. Maximum values of side friction demanded on dry and icy roadways are determined and used to calculate the margin of safety provided at various speeds. It was found that the current design standards are quite conservative and provide a more-than-sufficient margin of safety for motorists.

This paper appears in Transportation Research Record No. 1435, Pavement and Traffic Monitoring and Evaluation. 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

01401245

English

p. 145-152

1994-9

Transportation Research Record

0309055121

Figures (3) ; References (20) ; Tables (2)

Automobiles by type; Curvature; Curves (Geometry); Evaluation; Friction; Motor vehicles; Pavements; Rural highways; Speed; Traffic speed; Two lane highways

Horizontal curvature; Pavement conditions; Side friction; Vehicle type

Design; Highways; Pavements; Planning and Forecasting; Safety and Human Factors; I21: Planning of Transport Infrastructure; I82: Accidents and Transport Infrastructure

TRIS, TRB

Oct 13 1994 12:00AM

• CAN THE HIGHWAY COMMUNITY BE READY FOR METRIC BY 1996?
• COMPARATIVE TESTING OF PROFILOMETERS
• COMPARISON OF WEIGHT DATA COLLECTED AT WEIGH-IN-MOTION SYSTEMS ON THE SAME ROUTE
• CORRELATION OF PRESENT SERVICEABILITY RATINGS WITH INTERNATIONAL ROUGHNESS INDEX
• CORRELATION STUDY OF CALIFORNIA PROFILOGRAPH AND K. J. LAW PROFILOMETER
• DESIGN AND RELIABILITY ASSESSMENT OF DATA ACQUISITION SYSTEM FOR LOUISIANA ACCELERATED LOADING DEVICE
• ELECTRICAL RESISTANCE TOMOGRAPHY IMAGING OF SPATIAL MOISTURE DISTRIBUTION IN PAVEMENT SECTIONS
• EVALUATION OF ROUGHNESS SYSTEM OF AUTOMATIC ROAD ANALYZER
• EVALUATION OF STRATEGIC HIGHWAY RESEARCH PROGRAM--LONG-TERM PAVEMENT PERFORMANCE SURFACE DISTRESS DATA COLLECTION PROCEDURES
• FEASIBILITY OF AUTOMATING PAVEMENT DISTRESS ASSESSMENT USING MATHEMATICAL MORPHOLOGY
• FINDINGS FROM FIVE YEARS OF OPERATING OREGON'S AUTOMATED WOODBURN PORT OF ENTRY
• GETTING BETTER TRUCK FLOWS AND LOADS: TRUCK WEIGHT CASE STUDY
• HEAT TRANSFER FROM VEHICULAR CATALYST TO PAVEMENT
• IMAGE-PROCESSING METHODS FOR AUTOMATED DISTRESS EVALUATION
• KANSAS EXPERIENCE WITH SMOOTHNESS SPECIFICATIONS FOR CONCRETE PAVEMENTS
• LONG-TERM PAVEMENT PERFORMANCE HISTORY OF SULFUR-EXTENDED ASPHALT TEST ROADS IN EASTERN PROVINCE OF SAUDI ARABIA
• MEASUREMENT OF TRUCK TIRE FOOTPRINT PRESSURES
• NETWORK-LEVEL PERFORMANCE EVALUATION OF ASPHALT-RUBBER PAVEMENT TREATMENTS IN ARIZONA
• OBJECTIVES AND CONTENT OF AASHTO GUIDE TO METRIC CONVERSION
• PREDICTION OF TIRE-ROAD FRICTION FROM TEXTURE MEASUREMENTS
• RELATIONSHIPS BETWEEN INTERNATIONAL ROUGHNESS INDEX AND PRESENT SERVICEABILITY RATING
• SENSITIVITY OF REAR WHEEL PAVEMENT LOADING TO VARIATIONS IN HEAVY VEHICLE PARAMETERS, SPEED, AND ROAD ROUGHNESS
• STRATEGIC HIGHWAY RESEARCH PROGRAM--LONG-TERM PAVEMENT PERFORMANCE INFORMATION MANAGEMENT SYSTEM