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In 2010, TxDOT was reorganized into four regions, North, South, East, and West. The regions are designated as Regional Support Centers. The number of districts remained the same. Each district, managed by a district engineer, is responsible for the design, location, construction, and maintenance of its area transportation systems.
CTR programs include the Austin and Dallas InterAgency Contract (IAC) projects, the Network Modeling Center, the Intercity Passenger and High-Speed Rail project, Mega-Region Freight, the Laredo Border Master Plan, the Advanced Institute for Transportation Infrastructure Engineering and Management, the Cooperative Research Program, the Texas Pavement Preservation Center, the Southwest Region ...
The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United States. Despite its name, the association represents not only highways but air, rail, water, and public ...
A dumbbell interchange along Ontario Highway 401 in Clarington, Ontario, Canada.This one features a loop ramp. The ramp intersections may also be configured as a pair of roundabouts [1] to create a type of diamond interchange often called a dumbbell interchange [citation needed] (due to its aerial resemblance to a dumbbell), and sometimes called a double roundabout interchange.
The Texas Department of Transportation (TxDOT) is a governmental agency and its purpose is to "provide safe, effective, and efficient movement of people and goods" throughout the state. [1] Though the public face of the agency is generally associated with maintenance of the state's immense highway system, the agency is also responsible for ...
The Manual on Uniform Traffic Control Devices for Streets and Highways (usually referred to as the Manual on Uniform Traffic Control Devices, abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the United States Department of Transportation (USDOT) to specify the standards by which traffic signs, road surface markings, and signals are designed, installed ...
Loop 9, as defined by TxDOT, is highlighted in red; it is unknown whether the remainder of the loop would receive this designation. Loop 9 is a proposed state highway that will be located on the southern fringes of the Dallas/Fort Worth Metroplex along the southern Dallas County line westward into northern Johnson County .
The primary US guidance is found in A Policy on Geometric Design of Highways and Streets published by the American Association of State Highway and Transportation Officials (AASHTO). [2] Other standards include the Australian Guide to Road Design Archived 2011-11-09 at the Wayback Machine, and the British Design Manual for Roads.