The most useful feature on new cars that I've seen are the Mercedes (I believe) proximity indicators on side mirrors.
There's a tiny red light that illuminates to the bottom left of the mirror when a vehicle is alongside the driver's car. Solves the blindspot problem in one swoop.
There's a tiny red light that illuminates to the bottom left of the mirror when a vehicle is alongside the driver's car. Solves the blindspot problem in one swoop.