Many existing cloverleaf interchanges were built over 60 years ago based on old design guidelines. Many of those cloverleaf interchanges have operational problems due to the inconsistency with current traffic demands. Cloverleaf interchanges create weaving areas between vehicles entering and leaving the freeway. This could cause an unsafe condition, especially in system interchanges with high speeds on freeways and low speeds on loop ramps. This research evaluates the traffic operation and safety of a new interchange design called left hook, which might show potential in mitigating cloverleaf interchange problems. The left hook interchange removes all the four weaving areas of a cloverleaf interchange. The evaluation was done using VISSIM and the Surrogate Safety Assessment Model (SSAM) in this study. Overall, 72 simulation scenarios (with over 360 runs) were tested to include various conditions in terms of traffic volumes, turning traffic ratios, traffic distributions, and truck ratios. Based on the results, the left hook interchange performed better with fewer queues, stoppages, and rear-end conflicts. However, to reach a more solid conclusion on the new design, more studies should be conducted.
Evaluating Traffic Operation and Safety of a New Interchange Design in Comparison to System Cloverleaf Interchanges
International Conference on Transportation and Development 2022 ; 2022 ; Seattle, Washington
2022-08-31
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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