I would say, it depends on you mostly. How you’re riding, how much you follow traffic rules and pay attention. And I think, that you can ride almost anywhere and it would be fine, if you know what you’re doing and are confident enough. If you look at those crazy messengers on fixies, riding in NY on youtube. They’ve learned to be very aware of surroundings and they can predict what’s going to happen 3 steps ahead and they don’t even follow traffic rules at all, they seem fine. But of course accidents can happen to enyone.