You are a farmer who wants to make money selling the milk that your cows produce. Fresh milk sells much higher than not fresh milk so you need to go to the market as soon as possible because you will make more money that way. But, before you can sell your milk to the market, first you need to go through mountains. You need to take all the necessary precaution as you might crash while delivering the goods.
It may be wise to take it slow at times, but you should also try to drive as fast as you can sometimes so you will make more money from selling milk.