The Contribution to the Procedure of Capacity Determination at Unsignalized Priority-controlled Intersections

  • Tomaž Tolazzi
Keywords: unsignalized intersection, roundabout, capacity, two major streams, pedestrians, critical gap

Abstract

The problem of minor vehicles crossing or merging into themajor stream at unsignalized priority-controlled intersections iswell-known. Numerous solutions involve various assumptionsconcerning the major headway distributions, number of majorlanes, critical gap distributions, etc. Such cases can be dividedinto two main groups: intersections with two streams (one majorand one minor stream) and intersections with more thantwo streams (more than one major stream and one minorstream). At roundabouts, also at single-lane roundabouts,there are similar problems like the ones at other unsignalizedpriority-controlled intersections. A vehicle at the roundaboutapproach can only cross the pedestrian crossing when a sufficienttime-gap between two pedestrians (or cyclists) is provided.A vehicle at the roundabout entries can only merge into the majorstream when a sufficient gap between the two vehicles in themajor stream is provided. Because of that, single-lane roundaboutscan also be treated as unsignalized intersections withtwo major lanes: the first one in its circulatory roadway and thesecond one on the pedestrian crossing.

References

0. Hagring: A further generalization of Tanner's formula.

Transportation Research Part B: Methodological.

Elsevier Science. Exeter. England. Volume 32 b. No. 6,

N. Wu: A universal procedure for capacity determination

at unsignalized priority controlled intersections. Transportation

Research Part B: Methodological. Elsevier

Science. Exeter. England. Volume 35 b. No. 6, 2001

0. Hagring: Estimation of critical gaps in two major

streams. Transportation Research Part B: Methodological.

Elsevier Science. Exeter. England. Volume 34 b.

No. 4, 2000

T. Tollazzi: Reduction of the roundabout capacity due to

a strong stream of pedestrian and/or cyclists, Promet -

Traffic- Traffico, Volume 11, No. 1, 1999

How to Cite
1.
Tolazzi T. The Contribution to the Procedure of Capacity Determination at Unsignalized Priority-controlled Intersections. PROMET [Internet]. 1 [cited 2019Dec.15];16(1):31-6. Available from: http://traffic.fpz.hr/index.php/PROMTT/article/view/571
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