Traffic signs and signals--Oklahoma.; Traffic engineering--Oklahoma.; Roads--Oklahoma--Design and construction--Safety measures.
Temporary traffic control devices (TCD) are a necessary part of highway work zones. These devices are used to warn motorists of hazards, advise them of the proper path through the work area, delineate areas where they may not operate, and to...
Oklahoma. Department of Environmental Quality--Periodicals.; Environmental protection--Oklahoma--Periodicals.
.... to enhance the quality of life in Oklahoma and protect the health of its citizens by protecting, preserving and restoring the water, land and air of the state, thus fostering a clean, attractive, healthy, prosperous and sustainable environment.