Travelling in neutral (coasting) is considered bad mainly because it reduces your control over the car and can increase safety risks, especially on hills and in emergencies. It also doesn’t save as much fuel as people think, and can lead to extra wear on certain components like the brakes.

What “travelling in neutral” means

  • Travelling in neutral (or with the clutch fully pressed) disconnects the engine from the driven wheels, so the car is effectively free‑rolling.
  • Many driving and theory‑test resources refer to this as coasting and list it as a bad driving habit.

Why it’s bad for safety

  • You lose engine braking , so the car picks up speed more quickly downhill and you must rely almost entirely on the footbrake to control speed.
  • Relying only on the brakes over long or steep descents can overheat pads and discs, reducing braking effectiveness just when you need it most.
  • Because the engine is disconnected, acceleration is delayed if you suddenly need power to avoid a hazard; you must first re‑engage a gear, which costs reaction time.
  • Some road‑safety guidance notes that steering and overall vehicle stability can be worse when coasting because the car’s speed is less controlled and weight transfer is less predictable.

Why it doesn’t really save fuel

  • Modern fuel‑injected engines often cut fuel delivery on overrun when you stay in gear and lift off the accelerator, so the engine uses virtually no fuel while providing engine braking.
  • In neutral, the engine must burn a small amount of fuel to idle instead of being driven by the wheels, so the fuel saving people expect from coasting is usually minimal or non‑existent.

Extra wear and possible legal issues

  • Because engine braking is gone, you use the mechanical brakes more often and more aggressively, which can speed up wear of pads and discs.
  • Some motoring advice sites note that coasting may be treated as driving without proper control under road rules like the UK Highway Code, potentially leading to penalties if it contributes to unsafe driving.

Forum and “trending” discussion angle

  • On car forums and Q&A sites, coasting in neutral is often criticised as an outdated fuel‑saving trick that trades a tiny theoretical economy gain for a big hit in safety.
  • Drivers share near‑miss or crash stories where overheated brakes or delayed acceleration while coasting downhill played a role, reinforcing the view that it’s a risky habit rather than a clever hack.

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