Sand can be one of the trickiest surfaces to drive on. A lot of that is down to it being unpredictable and giving a lot of variation. Sand can be a firm surface that gives decent grip, or it can be a loose nightmare that will swallow you up to the axles the moment you make a mistake.
It also changes, often very quickly. Dry, loose sand can be firmed up by rain – but if it gets waterlogged, not just wet, it might drag you down even quicker than when it was dry. Wind can move sand surprisingly quickly, turning any dips in the ground into traps full of loose sand just waiting to catch you. But if there’s one thing that can shift the stuff faster than wind, it’s water.