To identify and assess potential mobility benefits from alternative design and control strategies at freeway merge and diverge locations, researchers conducted microsimulation studies of freeway locations from different states in 2017-2018. Strategies assessed included both geometric modifications as well as simulated applications of the following control strategies:
- Mainline Metering - dynamic signal control of mainline traffic under congested low speed operations
- Coordinated Ramp Metering - feedback-based ramp metering control using both upstream and downstream data, such as the Heuristic Ramp Meeting Coordination (HERO) algorithm
- Speed Optimization via dynamic traffic calming devices - dynamic variable speed limit signs or other measures to achieve medium free-flow speeds (e.g., 30 miles per hour) near ramp locations
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