I agree with Xavier Malcolm that cell phones are only a part of the problem albeit perhaps an important part. There is not a single time I drive to even a destination close to my house where I do not see drivers engaged in driving that lacks the most basic common sense in terms of either safety or efficiency. 
Oregon and likely the US in general does not place enough emphasis on driver education. It should be difficult to obtain a drivers license, something one only achieves if one has both the knowledge and the skills. People do not PAY ATTENTION to what they're doing, they are ignorant of the rules of the road or they simply have no driving skills/knowledge whatsoever. Many people drive as if they are the ONLY person on the road, call it autistic drivers syndrome. Sometimes I just look at other drivers who also witnessed yet another act of driving stupidity, put my finger to my head and pull the trigger. My horn is getting worn out.