A pilot program aims to find new ways for the state to pay for road maintenance by charging drivers for the amount of miles driven. Gas tax revenues are starting to dry up with the rise of electric vehicles on the road. Caltrans is now enrolling people in a six month pilot program to test out the concept of charging drivers about 3 cents per mile. "What's unique about this pilot is this time we'll be collecting actual revenue from participants," said Lauren Prehoda with Caltrans' Road Charge Program. Prehoda adds in 10 years the state potentially could be facing a $4.4 billion shortage because of the dwindling gas tax revenue. The state said it shells out more than $8 billion a year to maintain roads, with much of the cost paid from money collected from gas taxes.