What? Right turns being generally permitted on red (after stopping, while yielding to traffic that has the right of way) does not mean you "cannot prohibit rig

What? Right turns being generally permitted on red (after stopping, while yielding to traffic that has the right of way) does not mean you "cannot prohibit right turns under any circumstances"-- there just needs to be a sign prohibiting them (or a red right arrow means the same-- you may not turn right while it's lit, although around here you'll usually see that paired with a sign because people are stupid). Cases where it's prohibited are plentiful, usually in cases where a right on red can't be executed safely (like if there's poor visibility around a corner) or if right on red would be disruptive to traffic flow.