Every August, Michigan drivers relearn a simple lesson: when the yellow bus starts flashing its lights, you stop. RELATED: The 11 Most Expensive Private High Schools in MichiganWith students heading back to class, the Michigan State Police (MSP) are reminding drivers what the school bus lights mean and how expensive impatience can get. When Michigan Drivers Must Stop for a School BusPhoto by Jackson Simmer on Unsplash yellow and red bus illustrationLet's make this as simple as possible: If a school bus is stopped in Michigan with its red lights flashing, approaching drivers from either direction must stop at least 20 feet away. Yellow flashing lights mean the bus is preparing to stop. Passing a Michigan School Bus Can Get ExpensivePhoto by Thomas Park on Unsplash yellow school bus with yellow school busPassing a school bus with flashing red lights can result in a civil fine of $100 to $500.