Abstract
Preventing Capacity Drop at Isolated Merging Bottleneck through Variable Speed Limit Control
Highlights
The throughput at a bottleneck section can be maximized near a critical density
When the density of the roadway section exceeds a critical value, the discharge flow rate is much lower than the capacity.[1,2,3] This phenomenon is well known as a capacity drop
These results indicate that capacity drops can be prevented by controlling the density of the bottleneck section
Summary
The throughput at a bottleneck section can be maximized near a critical density. when the density of the roadway section exceeds a critical value, the discharge flow rate is much lower than the capacity.[1,2,3] This phenomenon is well known as a capacity drop. To adjust the density of the bottleneck section, the arrival flow rate of the bottleneck should be decreased by reducing the speed of approaching vehicles. According to Cassidy and Rudjanakanoknad,(9) a capacity drop occurs when the occupancy reaches 27%, and the shoulder lane queue begins to shrink when the occupancy drops below 22% This result implies that the throughput at the bottleneck can be optimally maintained within the occupancy range from 22 to 27%. There was a decrease in discharge rate once the queue formed, while the discharge rate was entirely recovered when the density dropped below the critical density These results indicate that capacity drops can be prevented by controlling the density (or occupancy) of the bottleneck section. The discharge flow at the bottleneck is mainly dependent on the density or occupancy of the bottleneck, and the density or occupancy can be controlled by adjusting the speed of approaching vehicles from the upstream bottleneck
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