In recent years excessive amounts of parking search time has been identified as a significant contributor to urban congestion and as an important influence in destination choice, in particular for shopping. Recent studies of parking behaviour have found that parking search time can constitute up to 25% of the average total travel time (Polak and Axhausen, 1990). Anecdotal evidence indicates even higher shares. The same studies also ...

In many surveys, for example of crime, illness, travel, purchasing etc, the amount of information requested from the respondent is not known apriori to the survey designer. In situations like this, the design of the survey will aim to assure both the largest possible response, but also a significant data yield, i.e. reports of the survey object, for example episodes of illness, number of victimizations, number of trips undertaken, objects ...