Some traffic features at freeway bottlenecks

Some traffic features at freeway bottlenecks

Observations from two freeway bottlenecks in and near Toronto, Canada indicate that the average rate vehicles discharge from a queue can be 10% lower than the flow measured prior to the queue’s formation. Absent any influences from downstream, the queue discharge flows exhibited nearly stationary patterns that alternated between higher and lower rates. These alternating flow patterns were espec...

Traffic Behavior at Freeway Bottlenecks

Some Properties of Flows at Freeway Bottlenecks

The capacity of a freeway segment should be measured only when it is an active bottleneck. The properties of flows at active freeway bottlenecks have a bearing on both the definition of capacity and the procedure of capacity analysis. Past studies have examined the flow features at bottlenecks on several freeways in Toronto, Canada, and San Diego, California. This study examined 27 active bottl...

Optimal traffic control in freeway networks with bottlenecks

We consider optimally coordinated freeway traffic control for networks containing bottlenecks with capacity drop. Due to the multitude of traffic jams, and the spatial and temporal relationships between control actions and traffic behavior, this coordinated control problem is not as straightforward as for local control. The order in which the measures are applied may be relevant, or it may be p...

Applications of Wavelet Transform for Analysis of Freeway Traffic: Bottlenecks, Transient Traffic, and Traffic Oscillations

Abstract This paper demonstrates the capabilities of wavelet transform (WT) for analyzing important features related to bottleneck activations and traffic oscillations in congested traffic in a systematic manner. In particular, the analysis of loop detector data from a freeway shows that the use of wavelet-based energy can effectively identify the location of an active bottleneck, the arrival t...