No, the peace sign is the peace sign. You'd run into problems if you reversed it, so that your palm is facing you.
There are a lot of unwritten rules for things, especially public transport. Like always standing on the right hand side of escalators, always having your ticket ready for the barriers, having correct change, etc.
But you really need to be more specific. It'd be like asking what is the done thing in America. And probably for a lot of things it will vary according to where in the country you are.
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