Why do semi truck tyres often have spikes on the side?
Snow chains or tyre chains are the spikes that are often found on the side of the front tyres of semi-trucks.
These chains are used to help get a better grip on snowy or icy roads because the spikes can dig into the snow or ice.
In places with bad winter weather, semi-trucks are often required to have tyre chains to make sure they can drive safely.
Tire chains also make the car more stable and easier to control, which can be especially important when driving in bad weather.
Local and state laws control how tyre chains can be used on semi-trucks.
If you don't follow these laws, you could be fined or sent to jail.
It's important for semi-truck drivers to know what the rules are in the areas they will be driving in about tyre chains.