When can a tram driver increase the speed negotiating a curve of the road?

Explanation

Correct answer: When the last carriage leaves the curve.

Increasing the speed while the tram cars are still on a curve poses a serious risk of derailment due to centrifugal force. This force pushes the vehicle to the outside of the curve and increases with speed. Therefore, to ensure complete safety, the tram driver may only accelerate once the last carriage has left the curve and the entire tram is on a straight section of track.

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