BOSTON (AP) – An increasing number of states are installing warning systems designed to curb the number of deadly wrong-way highway collisions. In Massachusetts, a $2.6 million pilot program consists primarily of wrong-way vehicle detection systems at highway ramps. When the system discovers a car entering a ramp in the wrong direction it sets off flashing lights, signs and, at some locations, audible alarms to alert the driver. Each year in the United States, wrong-way crashes result in 400 to 500 deaths. Older drivers, younger inexperienced drivers and drivers under the influence of alcohol are more at risk of causing wrong-way crashes.