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Glossary of Terms

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 August 2018.  If you have suggestions for future additions, please contact us.


  Glossary of Terms

The Council of Platinum Sponsors (CoPS) TollMiner & Glossary Working Group was created to improve definitions of toll facility concepts that are used in the IBTTA TollMiner Data Visualization tool. Since the TollMiner data and structure are closely linked to the IBTTA Glossary, a review and draft update of the glossary was performed during 2021.


Review the First Draft »

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Titlesort descending Description
Ramp Metering

Also known as Ramp Control and Motorway Access Control. Implementation of signal control measures on a ramp or on slip road to control the traffic entering the main road in order to ensure a smooth downstream traffic flow.


Manned or automatic lanes that are separate from the main plaza of a toll facility used for entrance to, or exit from the tollway.


Road Charging Interoperability. This project is financed by the European Commission and it proposes to make possible to carry out any road charging transaction in Europe with a single in-vehicle equipment. The RCI project will develop an open, integrated framework enabling road charging interoperability at the technical level based on the key existing and planned road charging deployments in Europe (AUTOPASS, EUROPASS, LSVA, TELEPASS, TIS, TOLLCOLLECT, VIA-T and VIA VERDE).


The RCTC is responsible for coordinating highway and transit planning and identifying projects for state and federal funding, and for all aspects of regionwide planning for Riverside County’s mobility.


Radio Data System – Traffic Message Channel

Real Time

Also known as dynamic or congestion pricing. With Real Time pricing, tolls are continually adjusted according to traffic conditions to maintain a free-flowing level of traffic. Under this system, prices increase when the tolled lane(s) get relatively full and decrease when the tolled lane(s) get less full. The current price is displayed on electronic signs prior to the beginning of the tolled section.


The process by which the Back Office is used to adjudicate conflicts in transaction data (e.g. the difference between an Automatic/Automated Vehicle Classification (AVC)-determined vehicle class and the customer’s pre-programmed tag class) and establish the toll amount to be deducted from the customer’s account.


Regional European Electronic Tolling Service - The REETS project is to support the existing EU legislation on the interoperability of electronic road tolls collection (see EETS). The project is focused on EETS compliant services in cross-border regional areas, including : Austria, Denmark, France, Germany, Italy, Poland and Spain, as well as Switzerland.

Registered Toll Customer

A toll facility user who has enrolled in either an RFID tag or "pay by plate" program.

Responsive Pricing

Pricing that is intended to change consumption patterns.


Radio Frequency Identification - Radio-frequency identification (RFID) is the wireless contactless use of radio-frequency electromagnetic fields to transfer data, for the purposes of automatically identifying and tracking tags attached to objects. The tags contain electronically stored information. Some tags are powered by and read at short ranges (a few meters) via magnetic fields (electromagnetic induction). Others use a local power source such as a battery, or else have no battery but collect energy from the interrogating EM field, and then act as a passive transponder to emit microwaves or UHF radio waves.


Research and Innovative Technology Administration (USDOT) - The Research and Innovative Technology Administration (RITA) coordinates the U.S. Department of Transportation's (DOT) research programs and is charged with advancing the deployment of cross-cutting technologies to improve [the U.S.] transportation system.

Road Pricing

Also called Value Pricing. A system by which congestion and improved roadways can be managed through different lvels of toll rates at peak and non-peak hours.

Road-Side Unit

The roadside infrastructure component of an ETC system; a receiver or transceiver that identifies the On-Board Unit in the vehicle, and identifies the account, permitting an electronic toll transaction to occur.  Also called a ‘reader,’ or ‘beacon.’  Also referred to as RSU.


Also known as a Rotary and a Traffic Circle. A road junction where traffic circulates in one direction.


Road Side Equipment


Road-Side Unit. The roadside infrastructure component of an ETC system; a receiver or transceiver that identifies the On-Board Unit in the vehicle, and identifies the account, permitting an electronic toll transaction to occur.  Also called a ‘reader,’ or ‘beacon.’


Road User Charge - User charges are direct charges levied for the use of roads, including road 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 the associated traffic congestion or other social and environmental negative externalities associated with road travel such as air pollution, greenhouse gas emissions, visual intrusion, noise and road accidents.