Looks like the minions are up to no good because that is what they do best. But, who are we to judge people. Besides, everyone needs a break and even minions know how to have some fun. They have organized a mini race, where only them can participate.
Choose your minion and drive your car as fast as you can till you reach the finish line. As a general rule, try not to hit other cars since it will damage your car too. Grab as much coins as you can and get those unknown boxes. Don't try to run over those pony on the road.