VARIABLE SPEED LIMIT (VSL)
Ver-Mac worked closely with Utah DOT and a Consulting Engineering Company to develop a Portable Variable Speed Limit (VSL) System designed to automatically change prevailing speeds downstream near active work zones. The system is designed to post the work zone speed limit only when approaching the active work zone. Utilizing portable sensors (Speed Mac VP), Ver-Mac’s JamLogic® software gathers speed data near the active work zone and can lower speeds further to harmonize speeds through the work zone. The test data supports higher compliance of speed limits by the motoring public near the active work zone and a reduction in work zone incidents.
VSL OBJECTIVES: • Improve worker & motorist safety
• Reduce speed differential approaching work zones • Improve harmonization of speeds through work zones
VSL APPLICATIONS • Any multi-lane highway or interstate work zone without robust barrier between motoring public and workers • Asphalt resurfacing projects • Any applications where a lane is taken intermittingly for construction VSL FEATURES • Two-digit 18-in. white LED display • 48 x 60 MUTCD compliant Speed Limit Sign • Speed-Mac VP Portable Sensor • JamLogic Software provides history of date, time, GPS location, speed and beacon activation. VSL BENEFITS: • IMPROVED SAFETY - Smoother transition to reduce speed differential – less shock waves and work zone intrusions • REDUCED SPEEDS - Tests have shown that motorists see the work zone variable speed limit sign and slow down. (up to 7 mph avg. speed reduction) • ENHANCED VISIBILITY - Two-digit white LED display provides positive behavior from motoring public
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