Signs placed months, or even years before they served their intended purpose

[roadfro]

Here's one:
https://www.google.com/maps/@33.9974251,-117.8628664,3a,60y,113.97h,101.54t/data=!3m6!1e1!3m4!1sF5yJD18B_n5F7oaYaRrtcA!2e0!7i16384!8i8192

The first line had green out for Lemon Avenue since at least 2007. When the new exit finally opened in 2019, Caltrans decided to add another green out saying "Lemon Ave/Brea Cyn Rd" instead of removing the green out.

Yeah, sensible thing to do there would have been to remove the greenout, and use a new greenout to combine the mileage for the single exit.

[wanderer2575]

Completion of the Ambassador Gateway project in the 2000s (to directly connect I-75 and I-96 to the Ambassador Bridge) was delayed due to disputes with the bridge owner.  When I took this photo, the gantry and BGSs for the truck ramp were installed before the bridge before it was constructed (right side of the photo, in the background).