I had a look on Google Maps at the area, and also at the photo (equivalent to Street View
). In daylight I don't think I'd make the mistake, but depending on lights, I could well see making an error in the dark. When I'm in my car I tend to check out new routes in advance, but sometimes I still go wrong if I miss a landmark even if I'm looking for it, or if a signpost doesn't actually say what I expect and so go past it (that was last month). I tend to realise fairly quickly that it's happened, but I don't think the crew had that much time.
Even if you're briefed, it's quite possible to miss something when you're unfamiliar with the route, especially with lots of other stuff going on at the same time. It wouldn't surprise me to find that there was a distraction in the cockpit at the critical moment approaching the turn.