Just been repairing some drain pipes and this one right in front of this parking seems prone to be hit. So to allow me more time in my garage and less time fixing things I thought out this idea to show people how close to the pipe they are. Very easy zip tie fixing to existing drain pipe.
Just place the golf ball on the pipe and as soon as you touch the pipe with the car's bumper the ball drops off. The golf ball seems to be heavy enough so the wind does not blow it off and light enough to fall off at the slightest touch of the pipe.
Can make it less sensitive by fitting a pipe joint at the top but lest first see.