There are many possible considerations to take into account when determining how large the parking spaces should be and how wide the aisle should be. Some of these are: what is the turnover? Is parking all day or do people come and go frequently? Will mostly small cars use the lot or will there be a mixture of small and large cars? Is it luxury use or elderly use where more room is desired? These are all and things that should be considered. However, since this sort of information is not given in the problem, we chose to select the space size and aisle width based on what will accommodate the largest cars built today, perhaps a little on the tight side, and comfortably accommodate mid-sized cars. The largest vehicle in the Road & Track Magazine list is long [1]. So making the spaces long will accommodate that vehicle. A length of allows over extra for the “average car”; 95% of all vehicles in the list will have over extra. The maximum width in the list was , so choosing a space width of will allow enough room for that vehicle although getting in and out of the car may be a bit tight. But the average width is , allowing almost of extra, plenty of room to get in and out of a car; 95% of the cars are under wide, allowing almost for entry and exit. In the next section it will be shown that aisle width depends on the turning radius of the vehicle. The turning radius must be less than the width of the aisle. The maximum in the list was so we made the aisles wide assuming right-angle parking (the width varies with diagonal parking but always depends on the “maximum radius”). The average turning radius is and 95% fall within , so is an acceptable choice.