Standing beside the car on a highway shoulder
The instinct after a breakdown is to hover near the car, inspect the damage and wait by the driver's door. On E311 or E11 that puts you a metre from traffic passing at 120 km/h. Exit on the barrier side, get behind the barrier, and stand well back from the car so that if it is struck you are not part of the collision.
Opening the coolant cap on a hot engine
A pressurised cooling system holds coolant well above boiling point, and cracking the cap releases it as scalding spray. It is the most common self-inflicted roadside injury there is. Switch off, wait a genuine thirty minutes, and let the attending technician judge when the system is safe to open.
Letting the tow decide the workshop
Agreeing mid-tow to the driver's suggested garage hands your negotiating position to a stranger with your car on his deck. Decide the destination before the truck arrives, your trusted workshop, the agency under warranty, or your own parking while you compare repair quotes, and confirm the full price to that destination in writing in the app before loading.