I think it's definitely a good thing. In that scenario, there is a margin of error. Like you said, just because it is one way street doesn't mean cars will only be coming one way. It's kind of like driving. You can be the best driver in the world, but if you only are watching what you are doing, you're not driving like you should be. If you're a good driver, you're not the problem - it's the bad drivers that are the problem and when they crash and burn, they are often taking people with them. So, you need to make sure that not only you are abiding by good driving practices, but you also have to watch everyone around you and be ready to react to their movements.