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

You'd then be asking who has the right of way at an intersection when 2 vehicles stop at the same time.

The rule is the person on the right has the right of way if the vehicle you tied with is cross traffic. Based on that rule, if I stop at the same time with the car on my left, I have the right of way (because I'm on his right), if I stop at the same time with the car on my right, he has the right of way.

However, If the vehicle you tied with is directly across from you, it doesn't matter which one of you go first unless one of you is wanting to make a left turn. If you're wanting to make a left turn and you tie with someone directly across from you, he has the right of way. If you tie with someone directly across from you and he's wanting to make a left turn, then you have the right of way.

Also, if there's ever a tie at an intersection and you know you don't have the right of way, it doesn't hurt to look at the other driver if they're signaling you to go through the intersection before they do, or if they're wanting to go first (no signaling).