Glossary

Annual average daily traffic is the average traffic volume passing over a stretch of highway in one day.

The carriageway is the part of the road used by vehicles. It is divided into sections for asset management purposes.

Corridor assets are assets such as lighting, traffic signals, signs, and guardrails that are not part of the road, but carry or provide services and other systems.

A culvert is a pipe or enclosed channel for carrying a stream or watercourse under the road. Large culverts have a cross-sectional area greater than or equal to 3.4m². So, small culverts will have a cross-sectional area less than 3.4m².

Heaving or shoving occurs when the road surface material is displaced to form a bulge next to a depression.

Levels of service refer to the quality of services provided by an asset or a group of assets.

Minor structures are small assets on the state highway network, such as retaining walls, sign gantries, and small culverts.

Road pavement is the base layers of compacted and graded stone on which the surface of the road is laid.

Roughness is a measure of the extent to which the road surface provides a smooth ride for road users.

Road surface is the top layer of the road.

Rutting is depressions that form over time on the road surface, usually from the wheel tracks of vehicles.

Skid resistance is the resistance of the road surface to skidding during vehicle braking or cornering.

Structural assets include bridges, tunnels, and large culverts. Roads, made up of road pavement and road surface, are also formally classified as structural assets. In this report, however, we generally do not refer to roads as structural assets.

The surface condition index is an index that summarises the different surface condition measures and takes into account the age of the road surface.

Surface texture is a measure of the coarseness of the road surface.