HSS

1) High speed ship. Very large catamaran (ie twin-hulled) hydrofoil principally used for ferry services such as with Stena Line's HSS vessels on the cross-Channel and North Sea routes and on Irish Sea routes between Northern Ireland and mainland UK - said to be capable of 50 mph. P&O operates a similar vessel the 'Superstar Express' out of Larne to mainland UK destinations.

HSC

1) Health and Safety Commission. Established under the HSWA1974 to administer and enforce the provisions of the Act through its operational organization, the HSE.

HR

1) Nationality symbol for Croatia - to be shown on the rear of vehicles from that country.

Hovercraft

1) An air-cushion vehicle for carrying passengers and/or freight over land and water. Rides on a cushion of air and can move in all directions.

HO/RT1

1) Home Office document used in connection with road traffic accidents (RTAs). Issued by police constable to drivers required to produce their documents (driving licence/certificate of insurance) at a police station within seven days.

Homologation

1) To make or confirm the same. In vehicle manufacture, a specified number of a particular model has to be built to achieve homologation (eg with sports cars for racing, model only admitted to certain racing series after, say, 500 identical examples have been built).