Netherlands

City: 
Tilburg
Facilities: 
A58
Facility Type: 
motorways
Objectives: 
reduce traffic emissions by reducing the maximum speed when daily air quality norms (PM10) are exceeded
Conditions: 
signal triggered for a concentration of PM10 over 50?g/m^3
Date Implemented: 
9-Apr
Other Information: 
Part of the Dynamax test programme
Operational Information
Concerned Vehicles: 
all
Type of Control: 
automated trigger signal/ manual control
Speed Information
Speed Variability: 
100 or 80km/h
Maximum Speed: 
120 km/h
Traffic Control Devices
Explanatory Signs: 
"smog"
Performance Measures
Operational Effectiveness: 
early results show a reduction in speeds of 10km/h when the posted limit is 80km/h, but could be improved by active enforcement and communication
Lane Speeds: 
One speed limit for all lanes
Enforcement
Enforcement: 
mobile radars deployed by the police