You should decline a clearance and ask for a modified clearance if you get ATC instructions that you feel might endanger your safety or lead you to break the law.
Take whatever prompt, reasonable action is necessary to keep your aircraft safe. even if it means violating the law. As soon as it's safe to do so, inform ATC of the problem and make the necessary corrections to the appropriate regulations.
An ATC clearance or instruction entitles an aircraft to proceed exclusively in relation to known air traffic and is entirely justified by the requirement to accelerate and separate air traffic safely.
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