**Maine carries the highest speed limit east of the Mississippi River, with Interstate 95 carrying a 75 mph (121 km/h) limit between Old Town and Houlton. Sections of I-95 south of Old Town as well as 295 carry 70 mph (113 km/h) limits, except for brief 50-65 mph (80–105 km/h) zones in more populated areas. The Saco stub I-195 is 60 mph, and I-395 is 60 mph (97 km/h) in Bangor and 65 mph (105 km/h) in Brewer.**

Default speed limits in Maine are 15 mph (24 km/h) in a school zone within 30 minutes of the beginning or end of a school day, or during recess, 15 mph (24 km/h) near an intersection “when the operator’s view is obstructed”, unless right-of-way is given via signage, 25 mph (40 km/h) in business or residential districts, or other built-up areas and 45 mph (72 km/h) on other roads.

In Maine, school buses may not exceed 45 mph (72 km/h) on roads with higher speed limits while transporting students. At other times, the limit is 55 mph (89 km/h), unless on an Interstate highway, in which case the posted limit applies.

Fines for speeding are at least $50 by law. Exceeding the speed limit by 30 mph (48 km/h) or more is considered a criminal offense.