If I press all my weight down on your hand with the palm of my hand that’s going to be a lot of pressure, now assume I do the same thing but I put a pencil between our hands, there is going to be a lot more pressure possibly piercing your hand.
Chains do a similar things with tires on the road, semis use them and all road work things use then because if they get stuck it’s one of the few ways to get out, it adds like 500x the normal traction
The reason trucks dont always use them however is because they 1. Add lots of weight to your truck wasting fuel and 2. Can tear up the road
Source: my dads a truck driver
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