One characteristic of Texas's freeways are its frontage roads (also known as service roads, feeder roads, and access roads).
Houston and San Antonio have extensive networks of freeway cameras linked to transit control centers to monitor and study traffic. Timed freeway entrances, which regulate the addition of cars to the freeway, are also common. The " Texas T", an innovation originally introduced in Houston, is a ramp design that allows vehicles in the HOV lane, which is usually the center lane, to exit directly to transit centers or to enter the freeway directly into the HOV lane without crossing multiple lanes of traffic. Texas Department of Transportation (TxDOT) planners have sought ways to reduce rush hour congestion, primarily through High-occupancy vehicle (HOV) lanes for vans and carpools.
On heavily traveled since their 1948 beginnings with a several-mile stretch of Houston's Gulf Freeway, and are often under construction to meet the demands of continuing growth.
State Highway 45, the first of several toll roads in Central Texas, under construction
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