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billionair31 t1_j3nxnj2 wrote

Reply to comment by Yuppykiller in I've driven up and down I-5 100 times since 2014. here's some fun facts about to know by KanyeWaste69

Interesting, I really have no experience with concrete slab roadway design, so my ideas aren't "good" but any means, but I'm willing to guess!

My guess is it's from a repair where they ground into the slap, fixed something (rebar?) And then filled it back up.

A secondary guess would be something to do with drainage. Perhaps those spots get a little sitting water in the center so they create a little more space for it to sit as it drains, where it is less dangerous for drivers.

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Grndmasterflash t1_j3pphxx wrote

My understanding is when a road has those little rectangular "divots", there are tensioning cables within the concrete, not to be confused with common rebar. I think it was supposed to be the cat's meow a decade ago, but turned out not to be a efficient as hoped.

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