Combining queueing delay and geometric delay - Part 1 - TRL Software
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TRL Software > Support & Training > Articles > Combining queueing delay and geometric delay – Part 1

Combining queueing delay and geometric delay – Part 1

ARCADY and PICADY include “point-to-point journey times” which combine queueing delay at the give-way line, the time taken to negotiate the junction (geometric delay) and also the time to travel in a straight line from a user-defined upstream point to the ‘start’ of the junction and similarly on the exit. This gives a reasonable estimate for the total time taken, on average, to travel through the junction.

Note that this is only an estimate, because there are some elements of delay which may be counted in both the queueing delay and the geometric delay. For instance, drivers slow down on the approach to a roundabout, and this consists of both slowing down to a safe speed to negotiate the junction, and also decelerating to a speed slow enough to check whether there is a gap on the controlling traffic stream. Because some of the geometric characteristics of the junction contribute to both the geometric delay and also to the empirically derived capacity (and hence queueing delay), it can be seen that there is some overlap between the two types of delay. However, the overlap is usually small.

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