Variation in vehicle conflicts at a t-junction and comparison with recorded collisions. [Paper presented at the 2nd international traffic conflicts technique workshop - Paris, 10, 11, 12 May, 1979.]

A study has been made of the numbers of vehicle conflicts occurring over a period of six months at a t-junction where two main roads meet. Daily and hour of day conflict count numbers were obtained for week-days during the period of study. There was no evidence of either a day of week or a seasonal effect on these counts. However, although there was no regular pattern, definite day to day variation did exist. A marked pattern of variation in conflict numbers with hour of day was found. In both cases relations were demonstrated between conflict numbers and vehicle flow. The closest relation appeared to be that by hour of day. It was found that prediction, usually within about 10 per cent of the true value, of the long term daily average of conflict numbers could be made from two or three days' counts at this site. Collision data, recorded by time lapse cine film over the full 6 months of study, were not sufficient to make a meaningful comparison with recorded conflicts. (Author/publisher) This paper was presented at the 2nd international traffic conflicts technique workshop - Paris, 10, 11, 12 May, 1979.