That's quite unusual for an intersection that visually can be traversed also straight ahead to be right-turn only from one direction. There are such signs (209-

That's quite unusual for an intersection that visually can be traversed also straight ahead to be right-turn only from one direction. There are such signs (209-20), or arrows on the lane, but I'd imagine people to heed a stop light more than such signage (purely from experience, many drivers ignore such signs, and even those that don't often don't adhere to the rules by not using turn signals). Edit: Now that I've looked at the traffic light on Google StreetView, that right-turn only sign is also there. But of course, traffic lights take precedence when they exist. The intersection is also marked in a way to really discourage going straight (or left), but I'd still guess with only signs there'd be a few people who actually tried doing that.