Let's be honest with ourselves here. People drive fast because they don't care. If more people did care on the road, then you wouldn't see as many speed bumps in neighborhoods where the speed limits are 25mph, but everything thinks it's okay to fly around at nearly twice the speed.
People in trucks typically drive fast because they're higher off the ground. It's not a personal thing, but the higher off the ground you are, the slower your sense of speed is. I live in Tampa, and there are *a lot* of trucks here. I caught myself once doing over 50mph in a 25mph zone in a neighborhood (no speed bumps) while I was driving my friend's new car. Why? Because I didn't realize I was going that fast! Yep, I'm guilty too! But looking back I realized it was because I wasn't paying enough attention to my speedometer.
I tell people constantly that cars are weapons, and the heavier the car (or truck) you drive, the bigger your weapon is. Like guns, cars are to be handled with care, because careless driving, like careless weapon handling, injures and/or kills people. So care a little while on the road. While many accidents are just that, accidents, many can be avoided if we just cared a little bit more about what we're doing.
And seriously, get OFF your cell phones while driving.