I've scoured the TMC website and the Tesla forums trying to find the original post, but I can't. All I know is that I'm grateful. Someone responding to a post about a damaged bumper (it was ripped off after driving over a curb) posted a rule of thumb: line up the bottom of your side-view mirror with the object you're trying to avoid and you'll never hit it. They said it always works, regardless of vehicle. I have a very rare car (Panoz) that is known for low skirt in the front just ready to be damaged. I tried the technique and it works! Whoever your are, you saved me any future bumper damage on any car. Dinner on me.