Speeding isn't the whole problem. Although, with less experienced drivers, it can be a very bad mix.
Cell phones, IMHO, cause more traffic infractions than anything else. I'm addicted to my phone, but my main focus is always on the road. I watch my lane so intently, that I've passed my fiancé' head on without seeing her, in a damned Jeep that I paid for. I always watch straight ahead and off the the right for an escape route, only glancing into on coming traffic from time to time.
The younger generation just have priorities mixed up. Take your eyes off the phone until you're stopped.