Artificial intelligent assistant

How can I offer a test ride while selling a bike? I am selling a bike to someone I don't know from Craigslist. I expect that the prospective purchaser will want to test ride the bike before making the purchase. How can I prevent them from riding away with my bike during a test ride?

The simplest answers are ask for their ID, or for their car keys if they arrive by car. There are plenty of other options on various forums like

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