(a) At each and every location where street or highway construction work is to be conducted a sign shall be posted at least 1,000 feet from the construction site, or as close to 1,000 feet from the construction site as is practicable given the location of the site when workers are present, notifying all motorists as to the speed limit and displaying the words "construction work".
(b) No person shall violate any posted speed restriction or traffic restriction at such construction site referred to in subsection (a) of this section.
(c) Nothing in this section shall be construed to preclude prosecution of any operator of a motor vehicle who commits a violation of any other provision of this Traffic Code for such violation.
(WWaC 17C-3-4b)