Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 14 - Think and Discuss - Page 281: 93

Answer

As discussed in question 31, the truck's weight is spread over the contact area with the road. A heavy truck has a lot of tires to increase the overall contact area. This reduces the necessary air pressure in each tire, as well as the pressure exerted on the road.
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