The Michigan Senate has voted 25-to-11 to let trucks go 60 miles per hour instead of the current 55 mile-per-hour limit on highways where the maximum speed limit is 70.
The bill heads back to the House and is expected to be on Governor Granholm's desk soon.
The higher speed limit would apply to trucks that weigh ten-thousand pounds and truck-tractors with trailers.
Supporters say the legislation would help bridge the gap between slower and faster drivers, making it safer for all vehicles on the road.
But critics question the safety of letting trucks go faster.
Eight Democrats and three Republicans in the Senate voted against the bill.