• Image 01
  • Image 03
  • Image 04
  • Image 02
  • Image 05

Terms that are in use on this site.

There are 111 entries in this glossary.
All A B C D E F G H I L M O P R S T V W Z
Term Definition
HEADWAY

Scheduled time interval between two vehicles operating in the same direction on a transit route; may vary over the course of a day or week, with changes in rider demand.

HIGH INTENSITY DISCHARGE LAMP

An arc passing between two electrodes in a pressurized tube causes metallic additives to vaporize and produce light; HID lamps have a longer life and provide more lumens (light) per watt than many other light sources; available in mercury vapor, metal halide, and high/low pressure sodium.

HOV

High Occupancy Vehicle - A passenger vehicle carrying two or more persons; HOV lanes typically require a minimum number of occupants or charge a fee for a vehicle to use facilities.

HUMAN SCALE

Describes an area designed to allow pedestrians to comfortably walk from one location to another and interact with the built environment; an effort to create an appropriate relationship between human beings and the size/function of surrounding buildings; an emphasis on building features and characteristics which can be observed in close proximity, at the speed a pedestrian would travel.

HYDROLOGIC CYCLE

The cyclical movement of water between the earth and the atmosphere through precipitation, interception, runoff, infiltration, percolation, storage, evaporation, and transpiration.

Glossary 2.8 uses technologies including PHP and SQL