Glossary

Description
Tennessee Valley Authority (TVA)
See Acronym Cross Reference
Terrestrial Forests
A phrase that may be used to refer to 'upland' forests or used to describe forests that not associated wetland or swamp forest ecosystems. Forests that are not palustrine. One of potentially a dozen 'key' environmental impact indicators utilized for assessing the total impacts from a project on the natural and human environment.
Thalweg
The deepest point of a stream cross section. It is the low flow channel of the stream.
Thoroughfare
A facility with a functional purpose of moderate to low mobility and high access. The facility has no control of access, traffic signals, driveways with full movements and a minimum of 2 travel lanes without a median.
Thoroughfare Plan
See Comprehensive Transportation Plan
Threatened and Endangered (T&E) Species
Plants or animals that can receive protection under the ESA which are placed on a Federal list. Listing of a species as either threatened or endangered is a strict legal process. An 'endangered' species is one that is in danger of extinction throughout all or a significant portion of its range. A 'threatened' species is one that is likely to become endangered in the foreseeable future.
Top-down Construction
This construction method enables work to be undertaken above ground while digging underground, which makes it possible to shorten construction schedules; Sometimes used when constructing bridges. http://www.takenaka.co.jp/takenaka_e/school_e/sch03/03_6.html
Top-of bank. The upper edge of the streambank
May be the same as bankfull elevation in an unentrenched stream, or is called a terrace in the case of an entrenched stream.
Traffic Management Plan (TMP)
The Traffic Management Plan (TMP) is a cohesive program of operational and demand management strategies designed to maintain acceptable levels of traffic flow during periods of construction activities. http://ops.fhwa.dot.gov/wz/practices/best/view_document.asp?id=9&from=topindex&Category_id=113
Transportation Enhancement
Transportation Enhancement (TE) activities benefit the traveling public and help communities to increase transportation choices and access, enhance the built and natural environment, and provide a sense of place. To be eligible for funding, a TE project must fit into one or more of the 12 eligible categories and relate to surface transportation (see 23 U.S.C. 101(a)(35)). http://www.fhwa.dot.gov/environment/te/principles_pt1.htm
Transportation Improvement Program (TIP)
A published document which outlines project funding information, priorities, and schedules for a seven year period in North Carolina. This information is provided for projects and studies in various NCDOT divisions including highways, aviation, enhancements, public transportation, rail, bicycle and pedestrians and the Governor's Highway Safety Program.
Transportation Planning Branch (formerly known as Statewide Planning Branch)
Branch of the NCDOT that provides multi-modal transportation planning services to municipalities, counties, regions, MPOs and RPOs. The Branch includes the Transportation Planning Units (including Traffic Forecasting Groups), Technical Services Unit (including the Traffic Surveys Group), and the Research and Development Unit. http://www.ncdot.org/doh/preconstruct/tpb/about/
Travel Demand Model (TDM)
A tool that has specific analytical capabilities, such as the prediction of travel demand and the consideration of destination choice, mode choice, time-of-day travel choice, and route choice, and the representation of traffic flow in the highway network. These are mathematical models that forecast future travel demand based on current conditions, and future projections of household and employment characteristics. Travel demand models were originally developed to determine the benefits and impact of major highway improvements in metropolitan areas. http://ops.fhwa.dot.gov/trafficanalysistools/tat_vol1/sect4.htm
Trout Waters
Freshwaters protected for natural trout propagation and survival of stocked trout.
Type of Access Control
(Control of access - SeeAccess Control)
Typical Section
A basic description of the type of roadway. Includes number of lanes, shoulder or curb and gutter, lane widths, shoulder widths, median width if any, standard side slopes.
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