Local Government Quiz - Auto Accident

If a township officer, village board member, city council member, school board official and county commissioner are all in separate vehicles and traveling - in a single line - at a constant speed of 60 mph - in a forward direction - on a clear day - with no obstacles on the road, at which point is one of one of them unexpectedly likely to stomp on their brakes and cause a major pile up on a state or federal highway?