Where do I register complaints about a trucking company who
systematically forces it's drivers to violate DOT regulations?
Specifically logging violations, exceeding the 10 hour rule.

Hi! Thanks for the very important question.

You can log your complaints at the Federal Motor Carrier Safety
Administration which was established within the Department of
Transportation on January 1, 2000, pursuant to the Motor Carrier
Safety Improvement Act of 1999 [Public Law No. 106-159, 113 Stat. 1748
(December 9, 1999)].

The Federal Motor Carrier Safety Administration is the truck and bus
"safety agency.”

Its website says that the hotline to contact for any reporting on
dangerous safety violations involving a commercial truck or bus is at
1-888-DOT-SAFT (1-888-368-7238).

Federal Motor Carrier Safety Administration
http://www.fmcsa.dot.gov/aboutus/aboutus.htm 

Please read the following for more contact numbers.

Safe Transportation of Passengers by Motorcoach - and What it Means to
You
http://www.fmcsa.dot.gov/safetyprogs/bus.htm 

Search terms used: 
DOT Trucking Regulations violations

I hope these links would help you in your research. Before rating this
answer, please ask for a clarification if you have a question or if
you would need further information.

Thanks for visiting us at Google Answers.

Regards,
Easterangel-ga

while your answer was very helpful and put me in the right direction,
I still had to make 2 phone calls to get to the proper department that
assisted me with lodging my complaint.