With the tire 15 cm wide, the contact patch is 6 cm long. Now load the car with 50% more weight (500 kg). The additional contact area needed is 55 cm^2 per tire. If you assume that the side walls don't deform, the contact length increases to 9 cm.
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Washington County Fairgrounds. Directions: From I-540 take exit 66 to Highway 112. Turn South onto N. Garland/Highway 112. Turn Right onto W. Drake at stoplight, then follow left curve onto McConnell Road. The Washington County Fair is on the right, atop the hill. Parking: During evening hours, volunteers will be present to assist with parking.