You're right, of course there are differences from place to place... But the basic driving rules in most countries are governmed by an international treaty under the authority of the UN. Unless specified otherwise, guidelines that apply to one nation are applicable to others, especially considering our own traffic laws are based largely on US road rules, and the US is also signatory to the UN treaty.
I don't think there are very specific rules regarding the use of hazard lights written down under local traffic law, so I quoted guidelines from the highway code. It doesn't mean i'm right, and that we should follow the same rules outright but we might consider the same guidelines as "good practice".
For clarification: Dual carriageway = two lane road





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