C1.3 Data description

This research relies on a household travel survey undertaken in 14 local government areas in New Zealand. Between March 2003 and June 2010, 40,161 people were interviewed from 21,588 households; of these 34,311 people from 12,814 households generated valid responses. The data was supplied by MoT dated 25 February 2011. In general, the data is collected in the categories shown in table C.1. This report only focuses on analysing the trip data to determine deterrence parameters. The ‘trip’ variables supplied by MoT are listed in section C2.

Table C.1      Main data categories and descriptions

Main data category

Description

Household

Details about the household and its response to the survey

Person

Details about people in the household (information such as age, gender, experience, accident totals, occupation, income, driving, and work and school locations)

Trip

Purpose, mode, date, time, distance of each trip leg and vehicle information

Vehicle

Type, make, model, year, engine CCs and owner information for vehicles driven during the survey

Alcohol

Drinking session times and locations

Accident

Accident involvement over the last two years

Address

Text description of trip destinations

Accident locations

Text description of accident locations

Trip geocoding

Trip location (map references) and geocoded distance estimates

Address geocoding

Address location (map references)

 

The survey was geographically stratified using Statistics New Zealand definitions from the 1996 Census of Population and Dwellings[14]. The strata were based on the 14 local government regions, further stratified into main urban areas (MUAs) which have a population of at least 30,000; secondary urban areas (SUAs, which have a population between 10,000 and 30,000; and rural areas (RAs) which include minor urban areas with populations less than 10,000 and all other rural areas.

The sample sizes within local government regions were proportional to 2001 Census populations except the initial survey emphasis was as follows:

·         less than proportional: Auckland, Canterbury, Wellington

·         more than proportional: Hawke’s Bay, Nelson/Marlborough, Northland, Southland, Taranaki, Gisborne and the West Coast regions.