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12.0 Glossary

Traffic Model: A mathematical representation of traffic movement within an area or region
based on observed relationships between the kind and intensity of development in specific
areas. Many traffic models operate on the theory that trips are produced by persons living in
residential areas and are attracted by various non-residential land uses.

Transit: The conveyance of persons or goods from one place to another by means of a local,
public transportation system.

Transit Capacity: The RTP defines this as the seating capacity utilized by mode.

Transit-dependent: Refers to persons unable to operate automobiles or other motorized
vehicles, or those who do not own motorized vehicles. Transit-dependent citizens must rely
on transit, para-transit, or owners of private vehicles for transportation. Transit-dependent
citizens include the young, the handicapped, the elderly, the poor, and those with prior
violations in motor vehicle laws.

Transit-Oriented Development (TOD): A mixed-use community within an average 2,000-
foot walking distance of a transit stop and core commercial area. TODs mix residential, retail,
office, and public uses in a walkable environment, making it convenient for residents and
employees to travel by transit, bicycle, foot, or car.

Transit, Public: A system of regularly-scheduled buses and/or trains available to the public
on a fee-per-ride basis. Also called “Mass Transit.”

Transition Zone: Controlled airspace extending upward from 700 or more feet above the
ground wherein procedures for aircraft approach have been designated. The transition zone
lies closer to an airport than the outer approach zone and outside of the inner approach zone.

Translational Slide: A mass that moves down and outward along a relatively planar surface
and has little rotational movement or backward tilting.

Transportation Analysis Zone (TAZ): A geographic area that identifies land uses and
associated trips that is used for making land use projections and performing traffic modeling.

Transportation Control Measures (TCMs): Air pollution control measures in the Air
Quality Management Plan that are directed to reducing air emissions by reducing vehicle
miles traveled, vehicle idling, or traffic congestion. Federal and State law specifies
requirements for TCMs. Steps taken by a locality to adjust traffic patterns (e.g., bus lanes,
right turn on red) or reduce vehicle use (ridesharing, high-occupancy vehicle lanes) to
reduce vehicular emissions of air pollutants.

Transportation Demand Management (TDM): A strategy for reducing demand on the
road system by reducing the number of vehicles using the roadways and/or increasing the
number of persons per vehicle. TDM attempts to reduce the number of persons who drive
alone on the roadway during the commute period and to increase the number in carpools,
vanpools, buses and trains, walking, and biking. TDM can be an element of Transportation
Systems Management. Strategies to change travel behavior in order to increase the efficiency
of the transportation system and achieve specific objectives such as reduced traffic

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Draft EIR