Colorado Code § 42-4-2001

Maximum hours of service - ready-mix concrete truck operators
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(1) 
Any person who operates a commercial motor vehicle solely in intrastate commerce for the
purpose of transporting wet, ready-mix concrete need not comply with 49 CFR 395.3 (b). No
such person shall drive for any period after:
(a) Having been on duty seventy hours in any seven consecutive days if the employing
motor carrier does not operate every day in the week; or
(b) Having been on duty eighty hours in any period of eight consecutive days if the
employing motor carrier operates motor vehicles every day of the week.
(2) Within a seven-day workweek all hours of service after sixty hours are voluntary
starting the next scheduled workday.
(3) Twenty-four consecutive hours off duty shall constitute the end of any seven or eight
consecutive-day period.
(4) Any commercial motor vehicle that transports hazardous materials shall be exempt
from this section and shall be subject to the federal hours-of-service limitations in 49 CFR 395
and 350.

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