Todd Southworth goes a mile down the road from Absolute Pi and puts another very similar sign on the scoreboard.
Mr. Southworth applies similar math here.
4 \times \arctan ( \tan ( 210^\circ + 15^\circ) ) = \pi
This sign is eastbound CA-210 at the transition to I-15 in Rancho Cucamonga, California. See sign on map!
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