THE DATA OBTAINED IN A PREVIOUS 'RESTRICTED-PATH' DRIVING EXPERIMENT APPEAR TO PROVIDE THE FIRST COMPREHENSIVE COLLECTION OF DETAILED INFORMATION ON DRIVER-VEHICLE BEHAVIOUR OVER A RANGE OF CURVE GEOMETRIES. HOWEVER, THESE DATA WERE OBTAINED ON UNSUPER-ELEVATED CURVES, WITH WELL-DEFINED LATERAL BOUNDARIES, SET OUT REMOTE FROM TRAFFICKED ROADS. THE PRESENT PAPER DESCRIBES A VALIDATION STUDY, CARRIED OUT ON ACTUAL INTERSECTION AND INTERCHANGE CURVES. THE BEHAVIOUR OBSERVED IS FOUND TO BE GENERALLY CONSISTENT WITH THAT REVEALED UNDER THE MORE CLOSELY CONTROLLED CONDITIONS OF THE RESTRICTED-PATH EXPERIMENT. AN EXPLORATORY INVESTIGATION OF THE EFFECT OF NIGHT DRIVING IS ALSO MADE. THE RESULTS SUGGEST THAT THE CONTROL STRATEGIES EMPLOYED BY DRIVERS WERE THE SAME AT NIGHT AS DURING THE DAY. (A). FOR THE COVERING ABSTRACT OF THE CONFERENCE PROCEEDINGS SEE IRRD ABSTRACT NO. 226354.
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