Glossary

Bitumen

A viscous liquid or solid impure mixture, consisting of hydrocarbons and their derivatives, used for road surfacing. It has waterproofing and adhesive qualities.

Bypass

An alternative route that enables through-traffic to avoid urban areas.

Carriageway

The portion of a road or bridge devoted to the use of vehicles, inclusive of shoulders and auxiliary lanes.

Culvert

One or more adjacent pipes or enclosed channels for conveying a stream below formation level and carrying water under a roadway.

Drainage

The removal of water by flow from the ground or from its surface.

Freeway

A divided highway for through-traffic with no access for traffic between interchanges and with grade separation at all intersections.

Highway

Highways provide connection between capital cities. They are also principal routes between a city and the major producing regions of the State. Highways also service major transport terminals or significant commercial and industrial centres.

Incidence rate

The number of Loss Time Injury/Diseases divided by the number of employees * 100.

Main Road

A principal road in the road system.

Median

A strip of road that separates carriageways for traffic in opposite directions.

Overlay

The addition of one or more courses of pavement material to an existing road surface, generally to increase strength, and/or to improve ride quality.

Overtaking/Passing Lane

An auxiliary lane provided for slower vehicles to allow them to be overtaken.

Pavement

The portion of a carriageway placed above the levelled surface or earth or rock for the support of, and to form a running surface for, vehicular traffic.

Realignment

A change in the geometric form of the original centre-line of a carriageway with respect to the vertical and horizontal axes.

Seal

A thin surface layer of sprayed bitumen.

Severity Rate

The number of LTI/Ds that resulted in 60 days or more lost, divided by the total number of LTI/Ds *100.