People on different kinds of trips are likely to have different degrees of need for speedy or safe or convenient or hassle-free journeys. I was under a lot of time pressure on this journey' as a pointer to the extent to which the journey was essential or discretionary. Trip Characteristics . Trip Context . The extent and nature of transport mode use is a central aspect of a person's lifestyle.
Transport joins up the places where people lead their lives.
Personal Resources Expended . When contemplating making a journey travellers will take into account the likely expenditure of personal resources involved. Time and money have been the dominant metrics in studies of transport choices. They have the value of being objective and being measured on scales with equal intervals. This is an interesting question, and one to which the answer is currently unclear.