If the administration has its way, trucks and buses would be capped at 60, 65, or 68 mph. All of the horrendous standstill traffic jams I’ve recently dealt with involved turned-over trucks, but it’s hard to say whether the trucker was reckless or some jackass cut him off. …all newly manufactured trucks, buses, and passenger vehicles weighing more than 26,000 pounds would be required to come equipped with devices limiting their speeds to 60–68 mph. That would cover big rigs, dump trucks, refuse haulers, many buses, and other large work trucks. The new rule is being touted by the feds as an important step toward fighting the rise in traffic fatalities across the country, as well as a key ingredient in lowering CO2 emissions.