Ground transportation includes all forms of non-air transportation, including car rentals, taxis, personal cars, trains, buses, etc. The category also includes emergency repairs to University vehicles, tolls, and parking fees.
Rental Cars, Personal Cars, Taxis, Shuttles, and Public Transportation http://afs.ucdavis.edu/our_services/travel-e-entertainment/travel/ground.html
University Owned Vehicle http://manuals.ucdavis.edu/ppm/300/300-30.pdf
Reserving University Owned Vehicles http://fleet.ucdavis.edu/