Someone needs to pull the new director of the Department of Motor Vehicles over and stop her from speeding heedlessly into the future. Joan Borucki wants to put global positioning devices in cars to track the mileage they travel. The idea is to more closely tie gas taxes to where cars go, the routes they take and the mileage they rack up, rather than the fuel they use. The problem inspiring this potentially Orwellian notion is that as more new and fuel-efficient cars take to the state's highways, the less the state gets in gas taxes to maintain highways. As...