The FSP fleet has several back up trucks. Each truck has been geographically assigned to nearby beats. The purpose of the back up truck is to continue the level of service when a truck is non-operable. Back up service is to be used to back up vehicles that are out of service due to mechanical failure, accidents etc. Back up service is not to be used to provide back up service for a truck that is unavailable due to routine maintenance and/or to back up a contractor with personnel issues (i.e., vacation, sick time, personal business, etc.).