(1) A person may not operate a vehicle at a speed greater than is reasonable and prudent under the existing conditions, giving regard to the actual and potential hazards then existing, including when: (a) approaching and crossing an intersection or railroad grade crossing; (b) approaching and going around a curve; (c) approaching a hill crest; (d) traveling upon any narrow or winding roadway; (e) traveling in, through, or approaching other hazards that exist due to pedestrians, other traffic, weather, or highway conditions; and (f) the speed causes the person to fail to maintain control of the vehicle or stay within a single lane of travel.

(a) approaching and crossing an intersection or railroad grade crossing;

(b) approaching and going around a curve;

(c) approaching a hill crest;

(d) traveling upon any narrow or winding roadway;

(e) traveling in, through, or approaching other hazards that exist due to pedestrians, other traffic, weather, or highway conditions; and

(f) the speed causes the person to fail to maintain control of the vehicle or stay within a single lane of travel.

(2) Subject to Subsections (1) and (4) and Sections 41-6a-602 and 41-6a-603, the following speeds are lawful: (a) 20 miles per hour in a reduced speed school zone as defined in Section 41-6a-303; (b) 25 miles per hour in any urban district; and (c) 55 miles per hour in other locations.

(a) 20 miles per hour in a reduced speed school zone as defined in Section 41-6a-303;

(b) 25 miles per hour in any urban district; and

(c) 55 miles per hour in other locations.

(3) Except as provided in Section 41-6a-604, any speed in excess of the limits provided in this section or established under Sections 41-6a-602 and 41-6a-603 is prima facie evidence that the speed is not reasonable or prudent and that it is unlawful.

(4) A violation of Subsection (1) is an infraction.

(5) The governor by proclamation in time of war or emergency may change the speed limits on the highways of the state.