Conceptual Physics (12th Edition)

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

Chapter 22 - Think and Explain: 55

Answer

The conducting tires "ground" the trucks (let any excess charge leak away).

Work Step by Step

That way, no sparks from built-up static electricity will occur, which might ignite the fuel. Sometimes fuel trucks drag chains or wires on the ground to accomplish the same purpose as the conducting tires.
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