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Many large vehicles drag a chain to keep static electricity from building up on the vehicle. The friction of the tires against the road can result in a static charge (much like rubbing a rubber balloon on something), and a spark jumping from the body of the vehicle to the ground could serve as an ignition source.

For obvious reasons, this is particularly bad if the vehicle is loaded with something that's highly flammable.

The chain is to provide a path back to ground, to keep any charge from building up.

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