[timun]

The problem is that unless you happen upon the intersection while it's in the "red right arrow" phase it's not entirely clear that there is a separate signal that prohibits right turns, and right turns on the solid red are permitted. The first time I drove through this I presumed it was a double-red—like at a left turn—wherein the lower red lamp was burnt out or malfunctioning.

Of course once you're through and you've seen a complete cycle of these lights the no-right-turn-on-red-arrow pictogram makes perfect sense, but it's an incredibly unusual traffic light. It should surprise no one that most people who approach it presume it means "no right on red".