system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When a bridge was built to carry a river over a road and a boat passes over the bridge, what affect would the boat have on the load bearing capabilities of the bridge?

I saw a meme of a bridge in The Netherlands that carried a river over a road and someone raised the above question.
gpt
"Effect".  And the boat would add load to the bridge as soon as it was placed in the water, and no additional weight as it passed over the bridge.  The boat displaces its own mass in water, and that mass is spread over the entire river.