Yes. A broken centre line means you may legally overtake the truck, but only when you are absolutely sure it is safe to do so (enough clear road ahead, no oncoming traffic, and suitable visibility).

What the broken centre line means

  • A single broken centre line on a two‑way road indicates that overtaking is permitted if conditions are safe.
  • You may cross the broken line to use the oncoming lane briefly to pass a slower vehicle, provided you can complete the manoeuvre without forcing oncoming traffic to brake or swerve.

When you can overtake the truck

You can overtake the truck if all of the following are true:

  • You have a long, clear view ahead with no oncoming vehicles.
  • Road and weather conditions provide good grip and visibility (dry surface, no heavy rain or fog).
  • You can accelerate, pass, and return to your lane without exceeding the speed limit or cutting in sharply.

If any of these are doubtful, you should stay behind the truck and wait for a safer opportunity.

Situations where you must not overtake

Even with a broken centre line, you must not overtake if:

  • There is an oncoming vehicle close enough that it might need to slow down or change course.
  • You are approaching a bend, hill crest, junction, pedestrian crossing, or other hazard that restricts your view.
  • Signs indicate “No Overtaking”, or other road markings override the simple broken line (for example, a solid line on your side in a mixed centre marking).

In many official driver‑theory style questions using this exact wording, the correct multiple‑choice answer is: “Yes, when you’re sure it’s safe to do so.”

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.