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.
The benefit-cost analysis covered a period of 20 years and assumed a two percent annual increase in traffic and a five percent decrease in personal injury accidents. Ancillary impacts on pollution and noise costs were assumed marginal and were not included in the analysis. The system costs data input into the analysis included construction and maintenance costs derived from recently built systems.
The implementation plan was designed to accommodate two types of facilities: motorways and dual carriageways (divided highways), and single carriageways (roadway with no physical separation). The following data excerpted from table 2 of the report show the combinations of technologies deployed.
Speed limit signs
Combined information and warning signs
Traffic monitoring stations
Road weather stations
Traffic monitoring cameras
|Motorways and dual carriageways||6 units /graded intersection if the spacing between intersections is longer than 5km speed limit repeater signs are required (4 units)||One for each carriageway for each intersection spacing||Every graded intersection spacing has one traffic monitoring station||One for every 15km||One for each graded intersection|
|Single carriageways||4 units /intersection if the spacing between intersections is longer than 5km speed limit repeater signs are required (2 units)||One for every other intersection spacing||One for each 20km||One for each 15km||One for each 20km|
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. Ratios increased for scenarios where higher safety benefits were assumed and control policies allowed for higher speed limits.
Construction and annual maintenance costs were evaluated at the 2004 level. The data below excerpted from table 3 of the report estimated average implementation costs, 20 year maintenance costs, and the cost distribution for construction costs.
20 year system maintenance and
Construction cost distribution
(traffic and cameras)
|Motorways and |
1 000 €/km/year
The estimates above show that the average cost to equip a dual carriageway was about double that of a single carriageway. Most of the construction costs were attributed to cabling.
Country-Wide Variable Speed Limits?
Author: Schirokoff, A., P. Rama, and A. Tuomainen
Published By: Paper presented at the XIII International Road Weather Conference (SIRWEC) 2006
Source Date: 25 March 2006
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Intelligent Transportation Systems > Road Weather Management > Traffic Control > Variable Speed Limits
Intelligent Transportation Systems > Road Weather Management > Surveillance, Monitoring, & Prediction > Atmospheric Conditions
Intelligent Transportation Systems > Freeway Management > Surveillance > Traffic
Intelligent Transportation Systems > Road Weather Management > Surveillance, Monitoring, & Prediction > Pavement Conditions
Intelligent Transportation Systems > Road Weather Management > Information Dissemination > Dynamic Message Signs
VSL, RWIS, ESS, Environmental Sensor Station, RWIS Station, road monitoring, weather station, environmental sensing station, CCTV, closed circuit television cameras, sensors, vehicle detector, traffic detection, traffic monitoring, congestion monitoring, DMS, CMS, VMS, Changeable Message Signs, Variable Message Signs