It is the operator's responsibility to exercise prudence and care in the operation of a County vehicle. This includes checking the lubricant levels, e.g., engine and transmission oil, as well as coolant levels, prior to operating the vehicle. Gauges and/or warning lights shall be monitored during operation. Any vehicle displaying such warnings shall be removed from service immediately and shall remain out of service pending inspection by a qualified mechanic. Continued operation of a vehicle when such warnings are evident may lead to costly repairs. Such negligence may result in disciplinary action.