1. (1) Where the average grade is six percent or more uphill for at least one mile, no person shall operate a motor vehicle in the far left lane of traffic of interstate 70 at a speed of less than the lower of ten miles per hour below the speed limit or the minimum speed set by the department of transportation, except if:

   1. (a) Necessary to obey traffic control devices;
   2. (b) Necessary to exit or enter interstate 70;
   3. (c) Weather or traffic conditions require speeds slower than the speed limit necessary under section 42-4-1101; or
   4. (d) Necessary because of a lane closure or blockage.
2. (2) The department of transportation shall post signs giving the public notice of this section.

Source: L. 2010: Entire section added, (SB 10-196), ch. 333, p. 1534, § 2, effective July 1.