Ontario MTO Truck Knowledge Practice Test

What color flashing lights do school bus arm signs have?

1. Blue

2. Green

3. Orange

4. Red

The correct answer is: Red

The correct answer is red. School bus arm signs are designed to enhance safety by alerting other drivers when children are entering or exiting the bus. The red flashing lights indicate that the school bus is stopped, and all vehicles must come to a complete stop. This is crucial for protecting the children who may be crossing the road. The other colors listed—blue, green, and orange—are not used for school bus arm signs and serve different purposes in traffic signaling. Blue lights are often associated with emergency vehicles, green lights might indicate a go or proceed signal, and orange is typically used for construction or warning signs. Therefore, red is specifically designated for school buses to ensure maximum visibility and caution among drivers when children are present.