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IBTTA’s transportation Glossary of Terms is an ever-changing list of terms used within the transportation and tolling industry.

The Glossary was updated in March, 2016.  If you have suggestions for future additions, please contact us.

  Download the Glossary of Terms.
 

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Titlesort descending Description
UDC

Urban Drive Control. Project of 4th framework research: UDC contributes to the integration of traffic management and longitudinal control of vehicles. Driving speed recommendations are sent via short-range communication beacons to vehicles equipped with adaptive distance and speed control.

UITP

International Association of Public Transport - UITP is the International Association of Public Transport. UITP advocates sustainable urban mobility, bringing together all public transport stakeholders and all sustainable transport modes, and engaging decision-makers, international organizations and other key stakeholders to promote and mainstream public transport and sustainable mobility solutions.  UITP’s headquarters office is located in Brussels, Belgium and the association counts 11 regional offices around the world.  http://www.uitp.org/vision-mission 

UMTS

Universal Mobile Telecommunications System

UNI

Unione Normatori Italiani. Italian Standardisation body.

UNINFO

An affiliated Italian body to UNI devoted to develop standard for Information Technology.

UPS

Uninterruptible Power Supply. A secondary source of power used to maintain system operation in the event that the source of primary power has become disrupted.

Urban Road Pricing

Also called road user charges (RUC), urban road pricing consists of direct charges levied for the use of roads, including  tolls, distance or time based fees, congestion charges and charges designed to discourage use of certain classes of vehicle, fuel sources or more polluting vehicles.  These charges may be used primarily for revenue generation, usually for road infrastructure financing, or as a transportation demand management tool to reduce peak hour travel and  associated traffic congestion or other social/environmental  externalities associated with road travel such as air pollution, greenhouse gas emissions, visual intrusion, noise and road accidents. 

USDOT

United States Department of Transportation.

User

Any driver driving on a Toll Facility. The User is the holder of an account and On-Board Unit. The User may use the On-Board Unit to pay for tolls or services. In toll collection terms the User may be referred to as the “motorist”.

User Charge

Payment of a given sum of money that allows the use of a service for a certain time period.

UTC

Urban Traffic Control. Network traffic control in urban areas. Utilizes signal controlled intersections in a network in order to optimize the performance of the network according to certain criteria.