When should happen when two vehicles arrive at a four-way stop the same time?

According to the rules of the road, when two or more vehicles arrive at an intersection with a four-way stop at the same time, the vehicle that has the right-of-way should proceed first. The right-of-way is generally determined by the following rules:

1. Yield to Traffic on the Right: If more than one vehicle arrives at a four-way stop at the same time, the vehicle on the right should proceed first.

2. If No Vehicles Are on the Right: If no vehicles are approaching from the right, then the vehicle that came to a stop first should proceed first.

3. Pedestrians and Emergency Vehicles: Pedestrians and emergency vehicles should always be given the right of way.

4. Hand Signals: If two vehicles arrive at the same time and are unsure of who should proceed, hand signals can be used to indicate the intention to yield or proceed.

It's important for drivers to be aware of and follow the rules of the road to maintain safety and prevent collisions at four-way stops. If in doubt, it's best to err on the side of caution and yield to other vehicles or pedestrians who may have the right-of-way.