encyclopedia

AUTHENTICATION

The act of verifying the eligibility of a user to gain access to computerized information. Typically designed to protect against fraudulent log-on activity.

AUTHORITY HAVING JURISDICTION

The “authority having jurisdiction” is the organization, office, or individual responsible for approving equipment, installations, or procedures. (Note: The phrase “authority having jurisdiction”, and “approval” agencies vary as do their responsibilities. Where public safety is important, the “authority having jurisdiction”…

AUTHORIZATION

Basic, substantive legislation which establishes or continues the legal operation of a federal program or agency, either indefinitely or for a specific period of time, or which sanctions a particular type of obligation or expenditure within a program. An authorization…

AUTHORIZATION TIME

Time issued by proper authority whenever instruction or authorization is given for appropriate rail activities.

AUTHORIZED FOR EXPENDITURE

The maximum amount of funds authorized for expenditure by the LACMTA for each contract or work order.

AUTO-FREE ZONE (AFZ, AUTO-FREE AREA)

An area in which normal automobile traffic is prohibited. Vehicular traffic is restricted to public transit, emergency vehicles, taxicabs, and delivery of goods (the last usually confined to certain time periods), or some combination thereof. (TRB)

AUTO-RESTRICTED ZONE (ARZ)

(Also called Auto-Restricted Area or Auto-Free Zone.) An area in which vehicular traffic is regulated by time of day and type of vehicle. Normal automobile traffic and, sometimes, delivery of goods are limited to certain times; public transit, emergency vehicles,…

AUTOMATED GUIDEWAY TRANSIT SYSTEM

Any guided transit mode, usually electric railway, with fully automated operation (i.e. no crew on the transit units). May be fixed schedule or in response to passenger activated call button. The term usually refers, however, only to guided modes with…

AUTOMATED GUIDEWAY TRANSIT SYSTEM (AGT)

Any guided transit mode, usually electric railway, with fully automated operation (i.e. no crew on the transit units). May be fixed schedule or in response to passenger activated call button. The term usually refers, however, only to guided modes with…

AUTOMATED HIGHWAY SYSTEM

A system designed to automatically control modified automobiles by external electrical signals emitted by sources such as overhead circuits or circuits embedded in the roadway.