May a driver be on duty for more than 14 hours?

Yes. A driver may remain on duty for more than 14 hours; however, the driver cannot drive a property-carrying commercial motor vehicle (as defined in 390.5) after the 14th hour after coming on duty. Also, the additional on-duty time will reduce on-duty time available under the 60/70-hour time limit. Note, however, that a driver using the short-haul exception for drivers of vehicles that require a CDL, as found in 395.1(e)(1), cannot use that exception on any day when the driver is on duty after the 14-hour limit.