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I drove by here today. If you are coming from Simon's Town road, you cannot drive down the Beach Road, because it is a oneway road. However, it looks like this used to be possible, since the Beach Road has a fork just before the Simon's Town. So if you are on Beach Road, you can turn left on to the Simon's Town Road, but if you turn right, then you end up in a cul de sac. This particular cul de sac looks like it was previously used for people to turn onto the Beach Road, who where  coming from the roundabout.