Signals, signs, and road orders
Red prohibitions stop the plan first
Red lights and prohibition signs are hard limits — don't try to reason around them.
What to watch for
The question mentions a red light, a no-entry sign, or a prohibited manoeuvre.
The rule
The rule explains exactly how to answer any question of this type — and why the obvious wrong answer fails.
See the rule →Common trap
Don't treat the road being clear as a reason to go through a red or prohibition.