The Brief Marietta City Schools bus drivers participated in a live-fire safety drill to prepare for emergency evacuations ahead of the upcoming school year. Emergency officials set a retired school bus ablaze to demonstrate how quickly heat, toxic fumes and heavy smoke fill the vehicle. Marietta City Schools bus drivers underwent emergency safety preparation by witnessing a controlled bus fire, emphasizing critical evacuation strategies ahead of the new academic year. Marietta bus safety trainingWhat we know:More than 100 Marietta City Schools bus drivers completed specialized emergency training featuring a controlled vehicle fire. School bus emergency readinessWhat we don't know:Authorities have not disclosed whether they'll do additional live-fire evacuation demonstrations.