Under a rule proposed Aug. 26 by the U.S. Department of Transportation, trucks and buses may have to be equipped with devices to limit their speed. The department will consider setting speed limits of 60, 65, or 68 miles per hour for heavy commercial vehicles. However, the department indicated that it will consider other speeds based on comments from the public. "There are significant safety benefits to this proposed rulemaking," said U.S. Transportation Secretary Anthony Foxx. "In addition to saving lives, the projected fuel and emissions savings make this proposal a win for safety, energy conservation, and our environment." The proposed rule states that all new U.S. trucks and buses weighing more than 26,000 pounds would need to be equipped with a speed-limiting device, and the maximum allowable speed would be decided after the agency receives public input. Both vehicle manufacturers and the companies that purchase and operate the vehicles would be subject to the rule, which is up for public comment for 60 days.