I'm just curious about those cement structures along certain stretches of the freeways. Are those pumping stations for keeping the roadway drains to continue draining, or are they for when an underground waterway crosses the freeway and needs to continue deeper in order to cross the freeways, and then pump the water back up to higher ground after going under it.

I am reminded of the Chapaton Drain that runs under I-94 at old 8 Mile Rd. in St. Clair Shores... and remember an old post about it having pump thru cement silos next to I-94 there.