Speed in curves

In a curve, the centripetal force acts on the car and pushes it outward. The higher the speed, the stronger the force. If it exceeds the grip of the road, you lose control.

The physics behind cornering

The centripetal force increases with the square of the speed. If you double the speed, the force trying to pull the car out of the curve quadruples. The same principle as for braking distance .

How to adjust your speed

• Reduce speed before the curve, not in the curve. Braking in the curve further reduces grip.
• Drive smoothly through the curve and accelerate carefully out of the curve.
• Look as far as possible into the curve to assess its sharpness.
• Be extra cautious in curves on European and national roads where the speed is high.

Dangerous curve situations

• Blind curves where you cannot see oncoming traffic. Warning signs such as “dangerous curve” indicate this.
• Wet or icy roads dramatically reduce grip. See speed and weather conditions .
• Gravel or leaves on the road can cause unexpectedly low friction.
• Downhill into a curve where the car speeds up on its own.

Assistance systems

Modern cars have Electronic Stability Control (ESC) which brakes individual wheels to counteract skidding. ESC is a lifesaver, but it does not replace proper speed choice. Read more about driver assistance systems and technology .

Remember that prohibition signs with reduced speed limits are often posted specifically at sharp curves.

Further reading

• Calculation of stopping distance
• Speed and weather conditions
• Rain, hydroplaning, and wind
• Adjusted speed and hidden danger