Why Some Bridges Have Load Restrictions?

Have you ever noticed weight limit signs on bridges? What if the bridge experienced higher loads than the weight limit signs? Will it collapse? How do we determine the weight limit on bridges? And what about bridges without weight limit signs. There is some interesting engineering behind weight limit signs, explained in this video.
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[@SequoiaGuy09]

I saw that everywhere!

[@emmanueldorcius8596]

your videos are awesome. can't believe you have such low views..

[@youngheroengineer]

Thanks for your support
Yeah, I question why too
But I think it is because my channel is still new, and YT does take a while to recommend new channels to someone like yourself.
Although this niche is quite big.
Anyway, I'm glad you liked my videos. More will come soon.