The other day, I was driving down the road, and I changed lanes. I thought I was far enough away from the other vehicles, but then I heard a loud honk. I quickly realized that the car was a lot closer than I thought it was. Considering that a lot of mirrors have that “objects in mirror are closer than they appear” warning, it makes it too easy to miscalculate the distance of a vehicle in the side view mirrors.

Full story: coolest-gadgets.com