Collection and evaluation of projected time gap using CAMDAS
Wang, Z. Chin, H.C. Lim, K.B.
Wang, Z.
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Abstract
Time gap is by far the most widely accepted measure for drivers' gap acceptance behaviours in gap acceptance studies. Nonetheless, time gap, as conventionally measured after a vehicle clears a fixed reference line in an intersection, is sometimes inadequate in representing gap acceptance behaviours, because it is measured well after a driver's decision-making time. Projected time gap (time gap 'projected' to a fixed reference line at the instance when a driver makes the crossing or merging decision), though intuitively a better measure, is beyond the capability of conventional methods. This paper, adopting CAMDAS-a Video Image Processing (VIP) software package - presents a practical approach, which is capable of extracting the distance gaps as well as the associated major-road vehicle approach speeds, and hence the projected time gaps. The relationships between time gap, distance gap, projected time gap and the major-and minor-road vehicle speeds are also established and evaluated.
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Road and Transport Research
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Date
2003-06
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Article