Major bike races usually require some road closures, much like the ill-fated Grand Prix of Baltimore that ran in the city from 2011 to 2013, but couldn’t attract enough sponsors. While the start and finish areas and any finishing circuits would need to be closed for a bike race, such races often use what’s known as a rolling enclosure that only shut down roads they pass only once for as long as it takes the cyclists and the race entourage to pass by.