Traffic and Safety

Network-wide impact of freeway bottleneck improvements

Freeway networks in urban areas contain a number of bottlenecks (merge, diverge, weave, curve, etc.) where congestion often occurs. The performance of these bottlenecks may be improved by a number of traffic management strategies such as ramp-metering, variable speed limits, capacity expansion, etc. However, traffic operations at these bottlenecks may not be isolated: an improvement of one bottleneck may impact the performance of other bottlenecks and hence the network wide performance. The objective of this study is to develop a systematic method to determine the interdependence of freeway bottlenecks, such that bottleneck improvements can be determined strategically and systematically.

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Idea No. 133