Hardware refers to the physical parts of a computer and related devices. Internal hardware devices include motherboards, hard drives, and memory. External hardware devices include monitors, keyboards, mice, printers, and scanners.

High-Occupancy Vehicle (HOV)

Vehicles carrying two or more people. The number that constitutes an HOV for the purposes of HOV highway lanes may be designated differently by different transportation agencies.

Highway Rail Intersection

A highway rail intersection, also called a highway-rail grade crossing represents a special type of intersection where a road intersects an at grade railroad track.

Host Vehicle

A connected vehicle that receives messages from a remote vehicle. Sometimes, the host vehicle is also used to describe the originator of a vehicular transmission of information to the RSU. (See Remote Vehicle)


HyperText Markup Language. A language for marking up documents with a set of tags that designate the design and display intention of the author and how sections or documents are linked together. These documents are displayed as pages with text and graphics that can be viewed through the use of a browser.

Hybrid Communications: Clustering

A communications technique that uses certain vehicles as gateways (cluster heads) between wide-area-wireless and short range wireless media. Some vehicles must have both short range and wide area wireless connectivity, and forward/rebroadcast data received over wide-area wireless to a short range wireless channel; other vehicles receive this information by short range wireless, and thus do not use wide-area-wireless for this data. Such vehicle gateways may be known as cluster-heads.