A Washington route includes a highway with three marked traffic lanes. Students would need to cross that highway after unloading. What is the correct route-safety conclusion?

1. The driver may allow the crossing if the stop arm is extended
2. The driver may allow the crossing if students are in high school
3. The driver should not allow the crossing; district routing must avoid it unless an allowed traffic signal or adult crossing guard arrangement applies
4. The driver may allow the crossing if traffic is light