It's not about safety. The 80k limit comes from limiting wear and tear on roads. Pretty much every semi truck is built to tolerate 120-150k without caring tho

It's not about safety. The 80k limit comes from limiting wear and tear on roads. Pretty much every semi truck is built to tolerate 120-150k without caring though wear and tear on the trucks really starts to increase a lot beyond that. Some states have higher weight limits when the ground is frozen.