Review on Industrial Grade Road Reflectors Pack of 10 for Speed Bumps, Sidewalks & Freeways by Kevin Witherspoon

I used some of these to mark the edge of my driveway. One of my cars has tinted windows and when I'm reversing at night it's hard to see the edge of the driveway. I placed some of them about 20 feet apart and when I reverse the light on the car these reflectors are easy to see. I didn't glue them, they have enough weight to hold them in place, they stay in place even if a lawn mower runs over them. I no longer roll down the driver's window to get a better view of the side mirror (because of the tinted glass). This completely solved my problem.