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Titlesort ascending Description
Overpass

Also known as Grade Separation. Where the traffic flows are separated by a bridge to carry one of the flows.

ORT Toll Plaza

*NEW* A toll point with an "ORT" or "MLFF" roadway for high-speed non-stop tolls, with a conventional toll plaza safely separated from the ORT lanes at the same toll point.

ORT

*UPDATED* Open Road Tolling, which is one or more lanes of free-flow tolls on a roadway, generally operated at the prevailing facility speed limit. ORT uses electronic toll collection and license plate image capture for collection of tolls, without an in-lane cash payment option. Future ORT lanes may also deploy other automated identification technologies “ORT” refers to the physical design of the toll point, whereas “AET (All Electronic Tolling)” refers to the methods of payment accepted at the toll point. In practice the terms are often used interchangeably.

Organisation For Economic Co-Operation And Development

The OECD groups 30 member countries sharing a commitment to democratic government and the market economy. Best known for its publications and statistics, its work covers economic and social issues from macroeconomics to trade, education, development, science and innovation.

Operator

*UPDATED* The entity responsible for a toll facility's day-to-day functions and services. A given toll facility’s operator may be the facility owner or may be a concessionaire under contract to the owner for various operational services such as toll operations and facility maintenance.

OPERA

Outil Pour l’Exploitation d’un Reseau d’Autoroutes. A system which monitors traffic conditions, predicts the traffic flows, analyses the impacts, then selects appropriate messages and continues to update these messages as required.

Open Toll Section

Section of a toll road where a fixed amount is paid, not depending on the distance traveled or on where the vehicle enters or exits the road.

Open Source Procurement

A process in which all qualified vendors are permitted and capable of bidding in the absence of requisite proprietary knowledge, hardware or software.

Open Protocol

A communications technology where all requisite knowledge is made available to vendors, operators and users at no cost, license fees, etc.

Open Barrier System

*UPDATED* An Open Barrier System is an arrangement of (typically mainline) toll points with discrete toll schedules for each location. Open barrier systems do not capture all potential trip origins and destinations and so allow some toll-free travel. An open barrier system may use ORT toll zones, or toll plazas.

On-Board Unit

OBU. The in-vehicle device component of a DSRC (or ETC) system. A receiver or transceiver permitting the Operator’s Roadside Unit (RSU) to communicate with, identify, and conduct an electronic toll transaction; also called a ‘transponder’ or ‘tag.’

On-Board Transponder

Also called a transponder,tag, and On-Board Unit. The in-vehicle device component of a DSRC (or ETC) system. A receiver or transceiver permitting the Operator's Roadside-Unit (RSU) to communicate with, identify, and conduct an electronic toll transaction.

OmniAir

OmniAir Consortium - The OmniAir Consortium, Inc. advocates for the development and promotion of certification for the Intelligent Transportation [Systems (ITS)] industry. 

OECD

Organisation For Economic Co-Operation And Development. The OECD consists of 30 member countries that share a commitment to democratic government and the market economy. Best known for its publications and statistics, its work covers economic and social issues from macroeconomics to trade, education, development, science and innovation.

OCR

Optical Character Recognition. Hardware and software system capable of recognizing alpha-numerical characters.

Occupancy

*UPDATED* The portion of time where a point or short road section is occupied by one or more vehicles. This data may be used as an input to measure congestion and establish dynamic toll rates. Note this is not the same as "vehicle occupancy," which refers to the number of people in a vehicle and is often used to determine managed lane eligibility or toll rates.

OBU Issuer

Organization that issues On-Board Unit (OBU) on behalf of the Contract Issuers.

OBU

On-Board Unit. The in-vehicle device component of a DSRC (or ETC) system. A receiver or transceiver permitting the Operator’s Roadside Unit (RSU) to communicate with, identify, and conduct an electronic toll transaction; also called a ‘transponder’ or ‘tag.’

O & M

Operations and Maintenance (Department).