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Field data collected over the last two decades show variable speed limit (VSL) systems can reduce crash potential by 8 to 30 percent.
FINDINGS
The data below excerpted from Table-1 of the source report highlights findings from the literature search.
Type of Test
Location
Major Findings
Field…
Content type
Date Posted
12/07/2012
Taxonomy (ARC-IT)
Incident Scene Safety Monitoring (PS07),
In-Vehicle Signage (TI07),
Dynamic Roadway Warning (TM12),
Autonomous Vehicle Safety Systems (VS01),
Reduced Speed Zone Warning / Lane Closure (VS09),
Variable Speed Limits (TM20)
Geolocation links
Mandatory dynamic automatic controlling Intelligent Speed Assistance (ISA) could reduce fatal crashes over the entire road network by more than 50 percent, whereas static informing ISA could still give a reduction of almost 20 percent.
FINDINGSThe role of in-car speed assistance systems can gradually become more prominent in speed management, in combination with traditional measures (infrastructural engineering, education,…
Content type
Date Posted
05/06/2011
Taxonomy (ARC-IT)
Autonomous Vehicle Safety Systems (VS01),
Infrastructure Enhanced Cooperative Adaptive Cruise Control (VS15),
Automated Vehicle Operations (VS16),
Eco-Approach and Departure at Signalized Intersections (ST08)
Geolocation links
Mandatory dynamic automatic controlling ISA (Intelligent Speed Assistance) could reduce fuel consumption and harmful emissions by 4 to 11 percent.
FINDINGS
The role of in-car speed assistance systems can gradually become more prominent in speed management, in combination with traditional measures (infrastructural engineering, education,…
Content type
Date Posted
05/06/2011
Taxonomy (ARC-IT)
Freight Administration (CVO02),
Eco-Approach and Departure at Signalized Intersections (ST08),
Autonomous Vehicle Safety Systems (VS01)
Geolocation links
In Finland, a benefit-cost analysis supported the deployment of weather information controlled variable speed limits on highly trafficked road segments.
RESULTSOverall, the results of the benefit-cost analysis were favorable for deployments along highly trafficked road segments. Starting (low-end) benefit-to-cost ratios ranged from 1.1:1 to 1.9:1.…
Content type
Date Posted
05/20/2008
Taxonomy (ARC-IT)
Infrastructure-Based Traffic Surveillance (TM01),
Integrated Decision Support and Demand Management (TM09),
Roadway Automated Treatment (MC03),
Traffic Information Dissemination (TM06),
Weather Information Processing and Distribution (WX02),
Spot Weather Impact Warning (WX03),
Weather Data Collection (WX01),
Infrastructure Monitoring (MC09),
Variable Speed Limits (TM20)
Geolocation links
A driving simulator study in Finland indicated that drivers cannot accurately assess road surface friction, thus the use of adverse road condition driver support systems can assist drivers in assessing adverse road conditions and increase safety and
The Technical Research Centre of Finland conducted a two-phased driving simulator study to compare adverse road condition driver support systems and to test a method of informing drivers of adverse…
Content type
Date Posted
01/15/2001
Taxonomy (ARC-IT)
Freight Administration (CVO02),
Eco-Approach and Departure at Signalized Intersections (ST08),
Autonomous Vehicle Safety Systems (VS01)
Geolocation links
In Finland, a road weather information system was estimated to save an average of 23 minutes per de-icing activity and improve traffic conditions.
FINDINGS
The duration of slippery road condition has been estimated to shorten 10-30 minutes per de-icing activity, which decreases the chance for accidents caused by slipperiness. Traffic will…
Content type
Date Posted
09/21/2000
Taxonomy (ARC-IT)
Roadway Automated Treatment (MC03),
Personalized Traveler Information (TI02),
Weather Information Processing and Distribution (WX02),
Spot Weather Impact Warning (WX03),
Winter Maintenance (MC04),
Weather Data Collection (WX01),
Infrastructure Monitoring (MC09)
Geolocation links
In Finland, a road weather information system was projected to yield a benefit-to-cost ratio of 5:1 by reducing annual vehicle costs, and improving motorist travel time and safety.
FINDINGSThe duration of slippery road condition has been estimated to shorten 10-30 minutes per de-icing activity, which decreases the chance for accidents caused by slipperiness. Traffic will…
Content type
Date Posted
09/21/2000
Taxonomy (ARC-IT)
Winter Maintenance (MC04),
Weather Information Processing and Distribution (WX02),
Weather Data Collection (WX01),
Spot Weather Impact Warning (WX03),
Infrastructure Monitoring (MC09)
Geolocation links
In Finland, a road weather information system was estimated to improve response times for road treatments, decrease the duration of slippery road conditions by 10 to 30 minutes, and eliminate 3 to 17 percent of crashes.
FINDINGSThe duration of slippery road condition has been estimated to shorten 10-30 minutes per de-icing activity, which decreases the chance for accidents caused by slipperiness. Improvement in…
Content type
Date Posted
09/21/2000
Taxonomy (ARC-IT)
Roadway Automated Treatment (MC03),
Traffic Information Dissemination (TM06),
Weather Information Processing and Distribution (WX02),
Spot Weather Impact Warning (WX03),
Winter Maintenance (MC04),
Weather Data Collection (WX01),
Infrastructure Monitoring (MC09)
Geolocation links
In Finland, the average implementation cost for a weather responsive roadside VSL system on a dual carriageway was estimated at 80,000€; average maintenance costs (including replacement costs) were estimated at 3,500 €/km/year.
In Finland, approximately 350 km of roadway have been equipped with variable speed limits—most of them are weather-controlled. This study estimated the benefits and costs of expanding the system.…
Content type
Made Public Date
04/28/2008
Taxonomy (ARC-IT)
Infrastructure-Based Traffic Surveillance (TM01),
Integrated Decision Support and Demand Management (TM09),
Roadway Automated Treatment (MC03),
Traffic Information Dissemination (TM06),
Weather Information Processing and Distribution (WX02),
Spot Weather Impact Warning (WX03),
Weather Data Collection (WX01),
Infrastructure Monitoring (MC09),
Variable Speed Limits (TM20)
Geolocation links
Study reports automated speed enforcement system costs 5.9 million euros in Denmark and 178,000 euros in Finland.
This study provides an overview of CERTU research on speed and automated enforcement implemented in Europe, Australia, and North America. The study outlined issues associated with data treatment and…
Content type
Made Public Date
09/30/2003
Taxonomy (ARC-IT)
Speed Warning and Enforcement (TM17)
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