Core: The hierarchy: which sign wins when they conflict

The second rung has a boundary that is often forgotten: a traffic light only outranks a traffic sign that regulates right of way — so shark's teeth or a B-sign. A closure sign or a speed-limit sign next to it keeps applying regardless, light or no light. The third rung lets a sign or marking outrank the bare traffic rule: a priority sign overrides the right-hand rule. Without a sign, light or instruction, you fall back on that bottom rung — never on 'no rule at all'. Book p.57-58 gives two worked examples confirming this order: whoever enters on green does not have to give way to someone running the red light at the same junction (light outranks sign/rule); and an instruction from a traffic controller in turn outranks even a red light.