Who has the biggest mobile home on the muddy camp ground? And who will help to get it out there? In this case, the mechanical differential lock helps the IVECO daily chassis. This characteristic from an off-road vehicle is much more effective than the break intervention in a normal car or in a SUV.
Every drive axle has a differential gear to allow both wheels to rotate differently while driving a curve. If one wheel is starting to spin ,because of ice on wet roads for example, the other wheel is not transmitting force anymore. In activating the differential lock, both drive wheels will be rigidly coupled. The slippery wheel won’t stop you anymore, the good grip - wheel will move you on.