Type of the traffic control strategy

Potential benefits

Limitations

Static Early Merge

Reduces merge related collisions, rear-end collisions; Increases free merges at higher traffic volume

Congestion, Lane-change crashes; Difficult maintenance of signage

Dynamic Early Merge

Provides varying no-passing zone based on detectors; Smooth merging

Ineffective for queues beyond the detectors; Results in higher travel time

Static Late Merge

Reduces queue length and rear-end crashes

Safety issues in low-volume and high-speed situations

Dynamic Late Merge

Changeable merge point is based on real-time information

Threshold volume and speed needs to be evaluated accurately