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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.

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Titlesort descending Description
DATEX

A data exchange protocol, structured in a set of technical annexes, containing also a database of road traffic related events, standardized by the CEN.

DDE

Direction Départementale de l’Equipement. A de-centralized department of the French Ministry of Transport made responsible to implement and to follow the national policy.

Dedicated ETC Lane

A lane in which only electronic toll transactions are processed.

Dedicated Short Range Communication (DSRC)

A short to medium range communications service that supports both Public Safety and Private operations engaged in roadside-to-vehicle and vehicle-to-vehicle communication environments. DSRC is meant to be a complement to cellular communications by providing very high data transfer rates in circumstances where minimizing latency in the communication link and isolating relatively small communication zones are important. Typically this refers to 5.9GHz communication.

DG INFSO

European Commission - Directorate General for Information Society

DG TREN

European Commission - Directorate General for Energy and Transport

DIMES

Digital IMaging Enforcement System

DMI

Danish Meteorological Institute

DMS

Dynamic Message Sign. See Variable Message Sign

DMV Hold

Department of Motor Vehicles Hold. A process whereby a vehicles registration can’t be renewed until any toll violations are settled with the toll agency.

DOT

Department of Transportation - Agency (either state or federal) that oversees local or national transportation systems.

DPI

Dots Per Inch (in photography)

DSRC

DedicatedShortType Range Communication. A short to medium range communications service that supports both Public Safety and Private operations engaged in roadside-to-vehicle and vehicle-to-vehicle communication environments. DSRC is meant to be a complement to cellular communications by providing very high data transfer rates in circumstances where minimizing latency in the communication link and isolating relatively small communication zones are important. Typically this refers to 5.9GHz communication.