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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
GALILEO

The GALILEO satellite radio navigation system, an initiative launched by the European Union and the European Space Agency, is based on a constellation of 30 satellites and ground stations providing information concerning the positioning of users in many sectors, including transport.

Gantry

A physical structure, generally located over the toll lanes, used for the location of ETC equipment, signs, etc.

GIS

Geographic Information System. A data management system designed to collect analyse and report geographic and demographic information.

GNSS

Global Navigation Satellite System

GPS

Global Positioning System used for positioning and road segment identification. Similar to GALILEO.

Gridlock

The situation on a road where demand exceeds capacity to the extent that traffic is rendered stationary for unacceptable periods.

GSM

Global System for Mobile Communications