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9309.0 - Motor Vehicle Census, Australia, 31 Jan 2011 Quality Declaration 
Previous ISSUE Released at 11:30 AM (CANBERRA TIME) 28/07/2011   
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GLOSSARY

Annual percentage change

A measure of the percentage change in a variable between one time period and another at an annual rate. This measure allows for the compounding of an increase or decrease over time. Thus an annual percentage increase of 10.0% results in a figure increasing by 21.0% over two years. The formula for calculating annual percentage change is :

Equation: Annual percentage change

where T1 is the value of the data item at the first time point, T2 is the value at the second time point, and M is the number of months between the two time points. This formula has also been used to calculate the percentage change over the five year period by replacing the '12' with '60' to account for the difference in time period.

Articulated trucks

Motor vehicles constructed primarily for load carrying, consisting of a prime mover having no significant load carrying area, but with a turntable device which can be linked to one or more trailers.

Attrition rate

The estimated proportion of motor vehicles taken off the register since the previous MVC. The attrition rate is also referred to as the motor vehicle retirement or scrappage rate. The number of registration lapses is calculated by adding the total registrations at the earlier MVC to the number of new motor vehicle sales between the MVCs, and subtracting the total registrations at the later MVC. The attrition rate measures the number of registration lapses as a percentage of the total potential vehicle fleet, where the potential vehicle fleet is the number of registrations at the first MVC date plus the number of new motor vehicle sales between the two MVCs. To calculate the annualised attrition rate as a percentage apply the following formula:

Equation: Attrition rate

where T1 is the number of registrations at the first time point, N1 is the number of new sales between the first and second time points, T2 is the number of registrations at the second time point and M is the number of months between the two time points.

Average age of vehicle

The estimated average age of registered motor vehicles in Australia. The age of a vehicle is defined as the number of years since it was first manufactured. The formulae below allow for the census being conducted on different months. Although the Motor Vehicle Census has been taken on different dates, it has always been taken on the last day of the month. These formulae also assume that vehicles are manufactured at a constant rate over the year, or three month period for the current year.

For vehicles manufactured in the current year:

      Vehicle age = snapshot month/24

For vehicles manufactured in previous years:
      Vehicle age = snapshot year - Year of manufacture + (snapshot month - 6)/12

The average age is then calculated as the sum of all vehicle ages divided by the total number of vehicles. Vehicles that have a year of manufacture unknown are excluded from calculations of average age.

Average annual growth rate

The average annual growth rate is calculated as a percentage using the following formula:

Equation: Average annual growth rate

where P0 is the population at the start of the period, Pn is the population at the end of the period and M is the length of the period between Pn and P0 in months.

Buses

Motor vehicles constructed for the carriage of passengers. Included are all motor vehicles with 10 or more seats, including the driver's seat.

Campervans

Self-propelled motor vehicles containing an area primarily used for accommodation. Included are motor homes and powered caravans.

Estimated Resident Population (ERP)

The official ABS estimate of the Australian population. Based on results from the Census of Population and Housing, it is updated annually between censuses using demographic statistics. To obtain ERP figures, the census count is adjusted for under enumeration and for Australian residents temporarily overseas on census night.

Fuel

The type of fuel is as reported to the registering authority and includes leaded petrol, unleaded petrol, diesel, LPG/other gases, duel fuel and other which includes electric.

Gross Combination Mass (GCM)

Tare weight (i.e. unladen weight) of the motor vehicle and attached trailers, plus its maximum carrying and towing capacity. GCM is the weight measurement used for trailer towing vehicles such as articulated trucks.

Gross Vehicle Mass (GVM)

Tare weight (i.e. unladen weight) of the motor vehicle, plus its maximum carrying capacity excluding trailers.

Heavy rigid trucks

Rigid trucks of GVM greater than 4.5 tonnes.

Light commercial vehicles

Vehicles primarily constructed for the carriage of goods, and which are less than or equal to 3.5 tonnes GVM. Included are utilities, panel vans, cab-chassis and forward-control load carrying vehicles (whether four-wheel drive or not).

Light rigid trucks

Rigid trucks of GVM greater than 3.5 tonnes and less than or equal to 4.5 tonnes.

Make

The manufacturer of the motor vehicle (e.g. Ford, Holden, Mitsubishi, Toyota).

Motorcycles

Two and three wheeled motor vehicles constructed primarily for the carriage of one or two persons. Included are two and three wheeled mopeds, scooters, motor tricycles and motorcycles with sidecars.

Non-freight carrying trucks

Specialist motor vehicles or motor vehicles fitted with special purpose equipment, and having little or no goods carrying capacity (e.g. ambulances, cherry pickers, fire trucks and tow trucks).

Passenger vehicles

Motor vehicles constructed primarily for the carriage of persons and containing up to nine seats (including the driver's seat). Included are cars, station wagons, four-wheel drive passenger vehicles and forward-control passenger vehicles. Excluded are campervans.

Rigid trucks

Motor vehicles of GVM greater than 3.5 tonnes, constructed with a load carrying area. Included are normal rigid trucks with a tow bar, draw bar or other non-articulated coupling on the rear of the vehicle.

Rigid trucks are divided into two categories:
  • Light rigid trucks of GVM greater than 3.5 tonnes and less than or equal to 4.5 tonnes
  • Heavy rigid trucks of GVM greater than 4.5 tonnes.

State/territory

The state or territory of the motor registry at which a vehicle is registered.


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