It was estimated that variable speed limit signs and lane control signals installed on the autobahn in Germany would generate cost savings due to crash reductions that would be equal to the cost of the system within two to three years of deployment.
A traffic management system of detection, lane control, variable message signs, and variable speed limits is used in Gotherberg, Sweden. Called Motorway Traffic Management it used in the Lundby tunnel and utilizes a system of loop detectors and video cameras to measure traffic volumes and speeds, for classifying vehicles, and for incident detection. Information is provided to motorist through a series of variable message signs. Lane control and variable speed limits are used to control traffic flow. Similar systems have provided a variety of documented benefits. In Amsterdam, the system reportedly reduced the "overall accident rate" by 23 percent, reduced the "serious accident rate" by 35 percent, and reduced the "secondary accident rate" by 46 percent. In Germany, the accident rate fell by 20 percent in areas where variable speed limit signs and lane control signals were used to warn drivers of congested conditions on the A5 autobahn between Bad Homburg and Frankfurt/West. On a comparable section of autobahn without control, accidents increased by 10 percent in the same time period.
The Germans estimated that the payback in savings from the reductions in accidents would equal the cost of the system within two to three years after deployment.
Innovative Traffic Control Technology and Practice in Europe
Author: Tignor, Samuel, et al.
Published By: Office of International Programs, U.S. DOT
Source Date: August 1999
Other Reference Number: Report No. FHWA-PL-99-021
Average User Rating
Intelligent Transportation Systems > Freeway Management > Lane Management > Lane Control
Intelligent Transportation Systems > Freeway Management > Lane Management > Variable Speed Limits
Intelligent Transportation Systems > Freeway Management > Information Dissemination > Dynamic Message Signs
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Typical Deployment Locations
managed lanes, VSL, DMS, CMS, VMS, Changeable Message Signs, Variable Message Signs