The accessibility approach can incorporate the road network computational power in GIS to obtain the quantitative value to evaluate the accessibility for a certain area. Dr. Su's student just came by to discuss her topic with me before.
I gave her the suggestion that the random sampling can be applied to obtain the average pattern of the accessibility in a large area. With the consideration of the uncertainty of traffic conditions, e.g. traffic light, traffic jam, or parking time, a range for the access time can be obtain to evaluate the mean and variability of the accessibility of certain area.
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