Technique for Continuous Recording of Vehicle Headway

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Abstract
A technique for the continuous monitoring and recording of time headway, using an application of the coincidence method of measuring distance, was developed for application in a portable closed-circuit television system. The system provides in each recorded video frame the necessary information to determine distance of the lead vehicle and instantaneous time headway in any following episode. Provision is also made for recording vehicle braking and time cm task. The system has been used successfully over a period of 4 mo. incorporating 600 hr. of observation in over 14,000 miles of driving. It provides a continuous and unambiguous record of the driver's performance in relation to vehicles ahead in both day and night driving. It does not require the use of observers either on the road or in the driving cab and thus the setting for the driver is naturalistic. Finally, it is unobtrusive in the sense that the driver need never be aware of the component of his driving performance under study.

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