Oklahoma Turnpike Authority - Provides organizational history and background information, turnpike maps, engineering drawings, and extension information, toll collection reports, and information and contacts for the PikePass automated toll collection system.
OKHighways.com - Includes photographs, route guides, and focus pages covering Oklahoma City and Tulsa.
Oklahoma Highways - Documents the history of highway development in Oklahoma from the earliest state routes to US highways.
Oklahoma Department of Transportation - Provides departmental organization and contacts, aeronautic, highway, public transportation, railroad, and waterway information, contracts, proposals, and construction standards and specifications as well as public service information and links to related state agencies.
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