What is the function of a differential lock (mechanically locked differential transmission)?

The differential lock is crucial for improving traction in challenging driving conditions. Specifically, it enhances traction during low-speed off-road driving and on slippery surfaces, addressing option 1. It also serves to evenly distribute torque to the driving wheels, which is essential for maintaining balance and control of the vehicle, corresponding to option 2.

However, option 3, which states that it improves handling during cornering, is not a characteristic of a differential lock. In fact, using a locked differential during cornering can lead to decreased handling, as the wheels need to rotate at different speeds due to the varying radius of the turn. Therefore, recognizing the correct functions of the differential lock is vital for safe operation of the vehicle under different conditions, as addressed by German traffic regulations emphasizing vehicle control and safety.