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Aakre E.,Traffic Engineering Research Center | Aakre E.,Norwegian University of Science and Technology
21st World Congress on Intelligent Transport Systems, ITSWC 2014: Reinventing Transportation in Our Connected World | Year: 2014

In severely oversaturated priority intersections and roundabouts, existing traffic modeling packages do not seem to provide realistic results. Gap acceptance theory is the basis for calculations on priority intersection and roundabout performance. However, when oversaturation causes queues on the major and minor road approaches, gap acceptance theory does not apply in practice. In many cases, modeling areas with heavy congestion is more important than modeling areas less severe conditions. Through thought experiments, field observations in Trondheim, Norway, and a literature review, this paper shows that the interaction between drivers in severely oversaturated conditions deviates from priority rules and gap acceptance theory. On this basis, a new approach to simplified modeling of oversaturated priority junctions and roundabouts is proposed.

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