Replace the operator and the subaru with a drone then the prospects change. With a single drone flying a programmed route at 20mph during daylight you'd have mapped the ~22000 miles of maintained roads in Los Angeles in under 100 days. Maybe you could contract with city vehicles who would like to have street view maps of their cities, and just stick the cameras on garbage trucks and the like and have the bulk of the area mapped before long over the course of their regular job duties coming into different areas.