This paper presents an experimental study with the aim of finding suitable dimensions of the entrances of cars used in taxi service for disabled people. Ambulant disabled people and wheelchair users who were entitled to travel with the special transportation service and were used to travel by taxi participated in the trials. An investigation of the taxi service showed that taxis transport both ambulant disabled people and people using wheelchairs, who can move from the wheelchair to a car seat. The disabled travellers found it difficult to enter and leave the cars due to the narrow doorways. The most difficult action was the lifting of their feet into and out of the cars.