The vehicles carrying inflammable fluids usually have metallic chains touching the ground :
(1) To conduct excess charge due to air friction to ground and prevent sparking.
(2) To alert other vehicles.
(3) To protect tyres from catching dirt from ground.
(4) It is a custom.

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Accepted Answer

To conduct excess charge due to air friction to ground and prevent sparking.

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The vehicles carrying inflammable fluids usually have metallic chains touching the ground :\n(1) To conduct excess charge due to air friction to ground and prevent sparking.\n(2) To alert other vehicles.\n(3) To protect tyres from catching dirt from ground.\n(4) It is a custom.

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