Review and evaluation of methods for estimating delay at priority junctions.

The Level of Service (LOS) for a priority junction is identified by the delay calculated for each movement. Because of the complexity of the traffic operations, various methods have been studied to evaluate more precise delay. This paper reviews benchmarks of these methods developed over past 55 years from Tanner's method, 1962, until now. The precision of these techniques is examined using real data from two priority junctions, i.e. three-legged formed, with multilane on the major and minor road. About 9-h data were gathered for each junction from morning until evening using video camera technique. This, in total, provided 18 hdata recording on normal working days. Then, observed delays incurred on minor road vehicles are compared with approximated delays from reviewed techniques. The study found that Brilon's and Troutbeck's methods that are the most popular methods provide consistent and closest calculated delay at priority junction. Additionally, Highway Capacity Manual (HCM) is an appropriate method only during low saturation where volume over capacity is less than 0.9. [ABSTRACT FROM AUTHOR]