Honorable old-fashioned way of regulation...
Load capacity of bridge.
Keep driving heavier and heavier trucks over bridge.
The one that falls into the river is too much weight.
I love the guy who smirked at me and said "I don't need to be no engineer to install a solar system on my roof. There they are, the panels"
"I got a question for you"
"What's that?"
"How you gonna wash them?"
"What do you mean, 'wash them' "?
"When they get really dirty you're going to lose most of their capacity"
"Huh? You gotta be ******** me!"
No, this was not in Mexico. This occurred in a VERY upscale region and neighborhood in California. Wotta hoot, a doctor's office medical complex nearby has to HIRE OUT workers and a cherry-picker boom truck to come and wash the panels on their roof.
Pretty Fartsmellers if you ask me...