Why Do Some Trucks Have Chains Dragging Along the Road?

Have you ever noticed trucks driving down the road and dragging a chain along the pavement? There are multiple possible reasons for this: some trucks use chains to release static electricity. Others have automated tire chains hanging from their frames.

What are automatic tire chains?

If you are driving behind a truck and see several strands of chains hanging from the left and right sides of its frame, these are likely automatic tire chains. If the weather is clear, these automatic tire chains should not be touching the pavement. But they will hang lose and may even rattle against one another as the truck drives down the road.