encyclopedia

HI-RAIL (ALSO HY-RAIL)

(Noun) Motor vehicle with both conventional highway wheels and retractable railroad guide wheels, used to travel over both highway and railroad tracks, usually for inspection and light repair of the track. (Verb) To travel over the tracks in a Hi-Rail…

HI-RAIL SWITCHER

A self-powered road-rail vehicle used for moving transit vehicles.

HIERARCHICAL DATABASE

A database structured in a tree root or “parent/child” relationship. Each parent can have many children, but each child may have only one parent.

High Occupancy Toll Lanes

A designated lane that motorists driving alone can use if they pay a toll, allowing them to avoid traffic delays in the adjacent regular lanes. HOT lanes are usually combined with high-occupancy-vehicle (HOV or carpool) lanes that have enough capacity…

High Occupancy Vehicle (HOV)

Summary of Policy The purpose of the policy is to ensure the long-term success of Los Angeles County’s HOV system. The Policies offer a strategy for optimizing the efficiency of HOV lanes and guiding future investments to complete the HOV network.…

HIGH OCCUPANCY VEHICLE LANES

Lanes in streets and highways set aside for High Occupancy Vehicles (vehicles with multiple occupants). Such lanes are also called “diamond” or carpool lanes and rules for their use are posted. Penal Code 1463.26, effective January 1, 1989, entitles the…

HIGH PLATFORM

A platform at or near the floor elevation of the transit unit (vehicle or train), eliminating the need for steps on a transit unit. (TRB)

HIGH SPEED GROUND TRANSPORTATION SYSTEM (HSGT)

A guided transportation system with exclusive right-of-way and vehicles intended to serve a densely traveled corridor at cruise speeds of 124 miles per hour (200 kilometers per hour) and greater. (TRB)

HIGH SPEED RAIL

A rail transportation system with exclusive right-of-way which serves densely traveled corridors at speeds of 124 miles per hour (200 kilometers per hour) and greater. (APTA)

HIGH SUBSIDY SERVICE

High subsidy service is any line, or segment of a line, with a subsidy per total service hours that exceeds 135% of the average for services operated by the MTA.