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SPD-HARM: Key Deployments
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•Germany’s Autobahns: Speed Harmonization via VSL Signing
•Implementation highlights:
•200 km of roadway covered
•Loops for traffic flow conditions, weather (fog) detectors
•VISSIM microscopic traffic simulation to tune VSL algorithms
•Advisory (non-enforced) speed limits
•Findings:
•20-30% crash rate reduction in speed harmonization zones
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Netherland’s A2 and A16: Speed Harmonization via VSL Signing
Implementation highlights:
•Loop detectors every 500 m; automatic incident detection
•Mandatory speed limits enforced by photo radar
•System revises posted speed limit every minute
•Objective to keep the posted and average actual speeds aligned
Findings:
•Increased traffic flow homogeneity (reduced speed variations)
•Less severe shockwaves and reduced average headways
•High compliance rates due to enforcement and public awareness of system
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