Two measures before an Iowa Senate panel would change speed limits in the state. A bill introduced by state Sen. Steve Kettering would push the speed limit for all vehicles on the state’s four-lane expressways from 65 mph to 70 mph and from 55 mph to 60 mph on all other primary highways. Under the bill, cities would maintain the authorization to set lower limits. State Sen. Maggie Tinsman, on the other hand, has introduced a measure that would lower the maximum allowable expressway speed from 65 mph to 55 mph for vehicles with a gross weight exceeding 10,000 pounds. Forty states currently have uniform speed limits for all vehicles using their highways.