No, not Groot. Or Rocket. Or even Mantis ... it's the Guardian of Traffic!

ALL HAIL THE TRAFFIC GOD!!

It's true -- the greatest athlete in the history of the city (maybe the world) is being subbed out for an image of the statue that overlooks traffic on the Hope Memorial Bridge.

City officials proposed the idea during a meeting early Friday morning -- claiming the statue is one of the "iconic landmarks" in town ... adding, "We all serve as guardians in terms of protecting and working within our community."

Okay, but honestly ... wouldn't you rather have Baker Mayfield or Bernie Kosar or Drew Carey?

Hell, throw Ricky Vaughn up there!

The Guardians of Traffic poster will include a slogan for the city -- "All For The Land."

And, if the guardian looks a little grainy to you -- it's 'cause the city wanted it that way ... saying it's a mosaic of "a composite of crowd-sourced images" of Clevelanders.

Immediate reaction to it hasn't been great ... with some tweeting, "Wait, is this real or a meme?"