Hourly Volume (HV)

The volume of traffic (given in units of vehicle per hour) that traverses across a segment of a roadway in one hour. The HV may be determined from traffic counts or may be a projected calculation. Refer to Design Hour Volume.

I

Incident

An incident may be any of the following: traffic accident, stalled vehicle, load spillage, or other action that effects one or more lanes of traffic. An "accident" typically involves a collision of a moving vehicle with another vehicle, person, or object.

Intelligent Transportation System (ITS)

ITS replaces the term Intelligent Vehicle Highway System. ITS is a surveillance system designed to monitor traffic flows on major freeways and to inform motorists or problem areas. Some ITS technology includes changeable message signs, cameras, and video detectors. ITS applications include: the integration of traffic control and transportation management systems; traffic signals which adapt to traffic and change control each cycle; highway advisory radio systems; changeable message signs (CMS); vehicle detectors; closed-circuit television; Global Positioning Systems and route guidance (currently used in some trucks, buses, and rental cars). An ITS may enable drivers to operate their vehicles more safely and with greater knowledge about existing traffic conditions.

Intelligent Vehicle Highway Systems (IVHS)

See Intelligent Transportation System.

Intermodal Surface Transportation Efficiency Act (ISTEA)

A Transportation Bill passed by Congress in 1991 that provides six year authorizations for development of a National Intermodal Transportation System which consists of all forms of transportation in a unified, interconnected manner. It increased the percentage of federal match funding available for the majority of Texas transportation projects. ISTEA was designed to move goods and people more efficiently by developing an integrated transportation infrastructure system for the United States. ISTEA is this country's first serious effort to promote intermodalism, the idea that all systems and structures for moving people and goods must function as an integrated and cohesive transportation network which includes rail and mass transit as well as highways. Under ISTEA, the statewide planning process must incorporate some new goals: to reduce congestion and improve air quality; to consider national and international commerce; to consider energy conservation; to create an integrated system of several modes; and to concentrate on the most efficient way to move goods and people, not just people. The three major components of ISTEA are the National Highway System, the Surface Transportation Program, and the Congestion Mitigation and Air Quality Improvement Program.

Intermodal Transportation

Transportation of persons and goods that involves the interchange between transportation modes such as surface routes, airways, and waterways. Intermodal transportation for surface transportation of people and goods includes the interchange between modes such as automobiles, mass transit such as buses, railway including

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