There's a lot of assumptions in the previous posts. You can't assume anything about another road user's potential actions, nor can you model a particular set of circumstances and develop a "standard" response. Every incident is different. People do U-Turn into oncoming traffic. Don't assume they won't. You shouldn't be following so close that you can't avoid or predict the "swerve left, mighty heave to the right U-turn".
The standard course of action should be making sure you are riding in a way that anticipates as many of the bonehead moves happening in front of you as possible. That way you'll stop having "moments".
The best thing you can do is try to practise the things you can think of, get some training every couple of years to help you with the things you haven't thought of, and get to know your machine and what it is capable of. Even the most humble of motorcycles can be made to do very surprising things.
Couple the above paragraph with always making sure that your bike is as mechanically sound as possible, and you should be able to avoid most things.
Whatever you do, don't develop habitual responses to perceived threats. People are great at coming up with new and terrifying ways to surprise you.
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