Possible explanations of phase transitions in highway traffic

C. F. Daganzo, M. J. Cassidy and R. L. Bertini

Transportation Research Part A: Policy and Practice, 1999, vol. 33, issue 5, 365-379

Abstract: It is shown that all the phase transitions in and out of freely flowing traffic reported earlier for a German site could be caused by bottlenecks, as are all the transitions observed at two other sites examined here. The evidence suggests that bottlenecks cause these transitions in a predictable way, and does not suggest that stoppages (jams) appear spontaneously in free flow traffic for no apparent reason. It is also shown that many of the complicated instability phenomena observed at all locations can be explained qualitatively in terms of a simple Markovian theory specific to traffic that does not necssarily include spontaneous transitions into the queued state as a feature.

Date: 1999
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