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"Gathering pipelines" carry natural gas or hazardous liquid from wells to other pipelines or facilities. The Department of Transportation recently started collecting data on all of these pipelines—such as size and construction material—to better understand safety risks.
The Highway Trust Fund—the major source of federal road and bridge funding—is largely supported by gas taxes. This revenue is decreasing as fuel economy standards increase and more alternative fuel vehicles travel the roads.
Coastal, Great Lakes, and inland ports are critical to the U.S. economy. Aside from moving freight, ports across the U.S. have a variety of non-freight activities—like cruise ship and ferry terminals, commercial fishing, recreation, and commercial and residential development.
Transit agencies and local governments have encouraged the development of mixed-use residential and commercial neighborhoods near bus or rail services to increase ridership and revenues. Local stakeholders and developers plan and build these "transit-oriented developments.