What to do if I am involved in a road accident between two border controls?

In many places the area between the two sets of border guards is taken very seriously indeed and is under the control (the firm control) of one of both sets of guards.

Since the natural reaction to a car accident or even a stalled car is to get out, either to look at the damage or to talk to the other driver, do this first, with caution.

There is a good chance that someone will yell loudly at you not to get out of the car. Friends of mine had a car stall in the 10m or so between the US and Canada border, tried to get out to push it, and honestly thought they were going to be shot. By Canadians. Border zones are serious. If this happens to you, freeze. Optionally, get back in the car. Someone will approach you. Report the accident to that person and do what that person says.

If nothing particularly happens when you get out to do the usual car trouble things, feel free to call the police force of your choice and report the accident. Should there be some administrative reason why you need to call the other police force, or the border authorities, the worst that will happen is you need to make a second phone call.