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Swiss Driving Theory · RTA / TRO

Cornering & vehicle dynamics

Most run-offs in bends are not caused by a bend that is too tight, but by an entry speed that is too high. Understanding the four phases means understanding why.

The four phases

Each phase has one job – mixing them up is what makes a bend dangerous.
1 Approach2 Turn in3 Follow through4 Accelerate
  1. Approach: look far into the bend, reduce speed and brake – before you turn the wheel.
  2. Turn in: steer smoothly, without jerks. The vehicle is already at the right speed.
  3. Follow through: constant speed, steady steering. No braking, no sharp acceleration.
  4. Accelerate: as soon as the wheel comes back and the view opens up, you can pick up speed again.

Remember: braking mid-bend asks the tyres to work in two directions at once – and that is exactly where grip runs out.

Centrifugal force

In a bend your vehicle is pushed outwards. This force rises steeply with speed: at twice the speed it is roughly four times as strong. A little too fast is therefore not a little more dangerous, but considerably more.

It acts on what you carry, too:

  • An unsecured load shifts towards the outside of the bend.
  • A tall vehicle with a roof load becomes noticeably less stable.
  • A trailer amplifies the movement and can jack-knife.

Tightening bends

Some bends close up progressively. You only notice once you are committed – and by then slowing down is difficult.

The remedy: enter wide, exit close to the inside edge. This lengthens your field of vision and leaves you a reserve if the bend tightens. On mountain roads and blind bends, always stay well to the right – someone may come the other way cutting the corner.

Remember: never drive faster than the distance you can see.

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