No citations were issued Thursday afternoon when a Warren County school bus driver was pulled over in neighboring Coffee County while returning from a field trip with a busload of students.The driver was replaced by a substitute strictly as a precautionary measure, according to officials.“We did it out of protocol and for comfort,” said Kate Walden, a spokeswoman for Durham School Services, the organization which handles the school system’s buses. “The driver was not cited and was found competent to be driving. In addition, our on-board technology allows us to check the driver and it found that everything was OK. Her driving was fine.”The bus was returning from a field trip in Murfreesboro when a parent who was following the bus called law enforcement to complain about the bus driver’s performance.