Today I was on the highway in rush hour on Interstate 25 in Denver, Colorado. The driver of this semi-truck was not wearing his seat belt and almost rear ended me because he felt the need to ride my bumper. I have former law enforcement experience and normally do not complain; in addition, he would speed and then slam on his brakes. Almost hit two other cars when I got out of the way. I called the main office and told them about this and gave the trailer number and I was supposed to get a call back but guess what - never did. Be very cautious about this company if they drive like this!!!!!