The Future of City Driving: Per-Mile Car Insurance

You wouldn't buy an unlimited fare card if you only took a few transit rides per month, but when it comes to car insurance that's pretty much how things work. Drivers who are similar in age, gender, and residence pay about the same premium even if some drive 5,000 miles a year and others 50,000 miles. The problem is not only that low-mileage drivers end up subsidizing high-mileage ones — it's that everyone has an incentive to drive as much as they can.

One idea to undercut this system is pay-per-mile car insurance. Earlier this month at The Atlantic, Matthew O'Brien explained (via this 2008 Brookings report; PDF) just how much America stands to save with such a service. Driving would fall 8 percent nationally; oil usage and carbon emissions would drop 2 and 4 percent, respectively; fewer traffic and accidents could be worth upwards of $60 billion a year.