Does anyone know if there is a lot of auto traffic between Stralsund and Rügen in early August? Is the traffic heavier on Fridays and Sundays?
Early August is THE main tourist season when almost all of Germany is on the road. There is always heavy traffic and it is worse on Saturday, starting Friday night.
Christine is right - but I do not know if it is that much of a problem in Rügen. Of course, more than in regular times - but you'll handle it... You might check that no holidays start or end at that weekend. But even then the problem rather is the autobahn than the connection bw Stralsund and Rügen. But it is just my personal guessing...