Turn Signals

So I was driving home from class on wednesday and I was driving approx 70 mph in the hammer lane and a car in the slow lane decided to switch lanes without looking, Idiot!. Turn signals must have been optional that year!. Its a good thing I always pay attention as I pass by cars on the interstate. People think they can just change lanes whenever their little fancy darn well pleases!! WRONNGG!!. People wonder why there are so many accidents. This just puts me over the edge as I sit in traffic!!