Rep. Washburne has introduced HB 1149 which would raise the speed limit for larger vehicles. Specifically, it would increase the Interstate speed limit for vehicles over 26,000 pounds would be 70 miles per hour. Currently the speed limit for such vehicles is 65 miles per hour.
I don’t know enough about the physics to know whether this is a good idea, a bad idea, or a wash. You have to think that heavier vehicles moving faster increases the risk or will at least increase the damage when accidents do happen. On the other hand, speed differentials are probably just as dangerous as trucks moving an extra ten miles an hour faster. Another consideration is probably fuel conservation. I imagine trucking companies would like to maximize fuel economy, and increasing speed limits may make it more difficult to do so.