The fracture phenomenon happened on several of same type of cars used for taxi. The road surface of taxi service area is bad with a lot of unpaved roads and roads need to be reconstructed.Fig. 2a shows a typical section of the road surface. Also, it is reported that the taxies usually take more than four passengers, which leads to over loading. To accommodate the passengers, the tire pressure is usually inflated at Pa, with the standard pressure to be Pa.