Citing safety concerns, the TTC is removing their "Walk Left, Stand Right" escalator signs system-wide. After we got sent a tip by reader Tom Mertron of Toronto Rants, a quick trip on the system this afternoon showed that only one of the four downtown stations that we checked -- St. Patrick -- still has the signs in place beside the escalators. At the others -- Museum, Dundas, and Queen -- they've been removed, and all......