I have a brick planter that sticks out into my driveway (see picture). My driveway isn't very wide and I have to back all the way down it. I know sooner or later either my girlfriend or myself will back into the edge and damage a car. Also, when the snow builds up in the wintertime I want to be able to mark the edge of it for the snowblower. Right now there's a warning reflector in the dirt but there's about 6 inches beyond it that stick out. How can I attach one of those orange driveway marker things on the edge of the brick?
An imperfect solution would be to hang a tennis ball on a string from the underside of the overhang.
It works for garages as well. Park the car perfectly how you to want to park it every time. Hang the tennis ball above the driver's windshield bracing, just barely touching. When you pull in, you line up the brace to the ball. When they touch, you stop. Keeps you from pulling in too far.