There will be several major road closures for the 2015 Rock ‘n’ Roll Savannah Marathon and Half Marathon.Vehicles trying to access downtown Savannah this weekend are advised to expect delays. The public should plan ahead to allow plenty of time to arrive at their destination.More than 30 miles of roads are closing down to welcome more than 20,000 runners from all 50 states and 21 countries as they descend on the streets of Savannah this weekend for the 5th annual Rock ‘n’ Roll Savannah Marathon and Half Marathon on Saturday, Nov.