Touch sensor for heavy vehicle

Hello
What are the possible means by which one can sense an external touch to a vehicle?
What kind of sensors would be needed for this?

Tesla coil

The most common are capacitive touch sensors

You want to detect when someone on the outside touches the vehicle? Anywhere or at specific points?

vehicle, is it a car or tricycle? or SSTO ship?

Thank you everyone for your comments. They have enhanced my understanding of the possibilities and have been very useful.

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