Mont. Code Ann. § 61-8-303

(2011)

Speed restrictions

(1) Except as provided in 61-8-309, 61-8-310, and 61-8-312, the speed limit for vehicles traveling:

(a) on a federal-aid interstate highway outside an urbanized area of 50,000 population or more is 75 miles an hour at all times and the speed limit for vehicles traveling on federal-aid interstate highways within an urbanized area of 50,000 population or more is 65 miles an hour at all times;

(b) on any other public highway of this state is 70 miles an hour during the daytime and 65 miles an hour during the nighttime;

(2) A vehicle subject to the speed limits imposed in subsection (1) traveling on a two-lane road may exceed the speed limits imposed in subsection (1) by 10 miles an hour in order to overtake and pass a vehicle and return safely to the right-hand lane.

(3) Subject to the maximum speed limits set forth in subsection (1), a person shall operate a vehicle in a careful and prudent manner and at a reduced rate of speed no greater than is reasonable and prudent under the conditions existing at the point of operation, taking into account the amount and character of traffic, visibility, weather, and roadway conditions.

(4) Except when a special hazard exists that requires lower speed for compliance with subsection (3), the limits specified in 61-8-312 and in this section or established as authorized in 61-8-309 through 61-8-311 and 61-8-313 are the maximum lawful speeds allowed.

(5) "Daytime" means from one-half hour before sunrise to one-half hour after sunset. "Nighttime" means at any other hour.

(6) The speed limits set forth in this section may be altered by the transportation commission or a local authority as authorized in 61-8-309, 61-8-310, 61-8-313, and 61-8-314.

Comparison view: showing changes between 2011 and the current version (2025). Green underlined text was added. Red strikethrough text was removed.

(1) Except as provided in 61-8-309, 61-8-310, and 61-8-312, the speed limit for vehicles traveling:

(a) on ~~a federal-aid~~ interstate an interstate highway outside an urbanized area of 50,000 population or more is 75 80 miles an hour at all times and the speed limit for vehicles traveling on ~~federal-aid~~ interstate highways within an urbanized area of 50,000 population or more is 65 miles an hour at all times;

(b) on any ~~other public~~ portion highway of ~~of this state~~ a national highway that is 70 10 miles ~~an hour during the daytime~~ or greater that has been expanded to four lanes, and ~~65 miles an hour during the nighttime;~~ that is not subject to a permanent special speed zone, as provided in 61-8-309 and 61-8-310, is 75 miles an hour during the daytime and 70 miles an hour during the nighttime;

(c) ~~in an urban district~~ on any other public highway of this state is 25 70 miles an ~~hour.~~ hour during the daytime and 65 miles an hour during the nighttime;

(d) in an urban district is 25 miles an hour.

(2) A vehicle subject to the speed limits imposed in subsection (1) ~~traveling on a two-lane road~~ may exceed the speed limits imposed in subsection (1) by 10 miles an hour in order to overtake and pass a vehicle and return safely to the right-hand ~~lane.~~ lane under the following circumstances:

(a) while traveling on a two-lane road; and

(b) in a designated passing zone.

(4) Except when a special hazard exists that requires lower speed for compliance with subsection (3), the limits specified in ~~61-8-312 and in~~ this section ~~or established as authorized in 61-8-309 through 61-8-311 and 61-8-313~~ are the maximum lawful speeds allowed.

(5) ~~"Daytime"~~ As used in this section, "daytime" means from one-half hour before sunrise to one-half hour after sunset. "Nighttime" means at any other hour.

(6) The speed limits set forth in this section may be altered by the transportation commission or a local authority as authorized in 61-8-309, 61-8-310, 61-8-313, and 61-8-314.

(7) A person who violates this section is subject to the penalties provided in 61-8-725.

Speed restrictions – definitions