Netherlands

City: 
Bodegraven-Woerden
Facilities: 
A12
Facility Type: 
motorways
Length of Controlled Section: 
14 km test for the shock wave solving algorithm (SPECIALIST)
Objectives: 
increase safety during bad weather conditions (rain, snow) and increase efficiency and reliability during peaks by reducing the maximum speed,
Date Implemented: 
9-Sep
Other Information: 
Part of the Dynamax test programme
Operational Information
Concerned Vehicles: 
all
Type of Control: 
automated
Speed Information
Change Frequency and Increment: 
rapid changes are possible to avoid large speed differences
Speed Variability: 
100km/h for precipitations over 2.5mm/h or 80km/h when over 6mm/h, speed limits continue when the road is still wet - speed is also controlled by an algorithm (SPECIALIST) sesigned to resolve shockwaves
Maximum Speed: 
120 km/h
Traffic Control Devices
Explanatory Signs: 
"slippery road surface' on matrix signs
Performance Measures
Operational Effectiveness: 
simulation of the shock wave resolver showed 10-20% improvement in travel time
Lane Speeds: 
One speed limit for all lanes