[holding answer 13 July 2006]: The number of car trips generated by each new house built is considered to be the same as the number of car trips generated by existing houses and, in Great Britain, is approximately nine trips per week.
Underlying this average are trip rates for different categories of households using information from the National Travel Survey. A key determinant of trip rate is the number of cars owned and the location of the household. For existing households in Kettering and Great Britain, the averages for households by numbers of cars owned is tabled as follows:
Number of cars owned by household Average car trips made in Kettering per week Average car trips made in Great Britain per week 0 4 4 1 7 8 2 plus 14 15
It should be noted that households with no car can still have a car available to travel. For example, they can hire a car or have access to a company car.