Which of the following factors has an impact on the increase of the braking distance of an agricultural tractor?

Reduced tyre grip on the road surface, caused for example by the wet, uneven or icy surface visible in the picture, is a key factor that lengthens the braking distance. Under such conditions, the friction between the tyres and the road is significantly reduced, which means that stopping the vehicle, including an agricultural tractor, requires a longer distance.