The North Carolina Highway Patrol is once again working with Watauga County Schools to ensure the safety of its children on buses. It's part of an effort by the Highway Patrol over recent weeks to crack down on drivers who pass stopped school buses with a mechanical stop sign extended. Those areas are now being targeted for increased monitoring and enforcement. Unmarked law enforcement vehicles are following school buses on some routes and cameras have been placed on buses to provide video evidence of violations, said Marshall Ashcraft, Watauga County Schools spokesman, in a press release Friday. Ashcraft encourages drivers to remember that stopping for a stopped school bus is not a simple matter of "stop and go."  Vehicles approaching a school bus displaying its mechanical stop signal and flashing red lights must stop and remain stopped until the flashing red lights are off, the stop signal is not displayed, and the bus has resumed movement.