(Salem, OR)  --  The state transportation department is looking for volunteers to participate in a trial run for a proposed state pay-as-you-drive tax.  The ODOT says gas taxes haven't been sufficient to fund road projects because people are driving less and in more fuel-efficient vehicles.  Under the proposed tax, drivers would be charged one-point-five cents per mile, tracking distances with a GPS device, a daily diary, or a special odometer.  ODOT will set up a "road user charge" website in January that will allow residents to sign up for information on how to become a volunteer.