In Vantage, Washington the deployment of an automated anti-icing system on I-90 was projected to eliminate up to 80 percent of snow and ice related crashes.
Made Public Date


United States

A Benefit/Cost Analysis of Intelligent Transportation System Applications for Winter Maintenance

Summary Information

To address weather related crashes on a section of Interstate 90 near Vantage, Washington; the Washington State Department of Transportation (WSDOT) assessed the benefits and costs of deploying an automated anti-icing system to prevent the formation of pavement frost and black ice and to reduce the impact of freezing rain. Poor road surface conditions contributed to 42 percent of total crashes and 70 percent of winter crashes. The high crash corridor extends from milepost 137.67 (the Columbia River Bridge approach) to milepost 138.49, near the State Route 26 Interchange. This corridor includes a 955-foot radius horizontal curve and a vertical alignment transition from three to five percent within the limits of the curve. The average daily traffic volume on this road section is 10,000 vehicles per day with 26 percent trucks.

The system design included a liquid chemical storage tank, a pump, a 3,100-foot dispensing system with barrier-mounted and pavement-embedded spray nozzles, an environmental sensor station (ESS), a computerized control system, and a closed circuit television (CCTV) camera for remote viewing. The control system monitors weather and road condition data from the ESS and automatically activates the dispensing system when predetermined conditions exist. The system also alerts dispatchers and the North Central Region maintenance supervisor when the anti-icing system is activated.

Using historical crash data, the annual rate of collisions over a three-year period was determined and compared to the expected rate of collisions after system implementation. It was estimated that 80 percent of the snow, ice, and wet pavement crashes would be eliminated (see key assumptions in notes below).
Goal Areas
Deployment Locations