Work Zone Safety & Mobility Solutions


In 2004, Minnesota DOT, Ver-Mac’s JamLogic division and a Consulting Engineering Company analyzed the benefits of Dynamic Late Merge (Zipper Merge) applications. The system is designed to have motorists use all lanes approaching the merge point and then alternate into one lane at the merge point. Utilizing portable sensors before a lane reduction, the system analyzes speed and occupancy of each lane before the merge. Based on the traffic flow data (Free Flow traffic, Slow traffic, or Stopped traffic), the system will provide specific real-time lane messages to motorists upstream to even the flow of traffic through the merge. The Zipper Merge is often used in combination with an AQW System to provide a more robust solution.

DYNAMIC LATE MERGE OBJECTIVES: • Improve worker & motorist safety • Reduce length of queues entering work zones • Increase throughput of interstate lane closures • Reduce work zone rear-end collisions • Reduce driver rage

Speed-Mac VP

DYNAMIC LATE MERGE APPLICATIONS • Any multi-lane highway and interstate work zone with lane closure • Expected daily queues of a ¼ mile or more • Routes with high-truck traffic • Routes where topography will limit visibility of approaching queue


• Portable Message Signs or Wig Wag Warning Trailers • Microwave sensors can be integrated into the system

Speed-Mac VPs are dynamic and can be moved around without affecting the logic. Ver-Mac’s JamLogic software will automatically recognize the new location of the Speed-Mac VPs.

DYNAMIC LATE MERGE BENEFITS: • IMPROVED SAFETY – Study found queues reduced up to 40% • ENHANCED MOBILITY – Study found throughput increased up to 15% • REDUCED REAR END COLLISIONS - Reduces the risk of rear-end collisions • LESS WORK ZONE INTRUSIONS – Slower more orderly merging reduces work zone intrusions


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