 To turn the road charge into a reality, next month Caltrans will launch a pilot program with 800 volunteers across the state. Participants will pay a monthly road charge with the number of miles they drive, either recorded electronically or by the drivers taking photos of their odometers. Caltrans predicts most drivers in the pilot program will end up liking the road charge. But it is easy to find people who are deeply suspicious of being taxed for every mile that they drive, even if they're no fans of the current gas tax.