Hall County Schools officials have canceled more than 20 field trips to the downtown Atlanta area amid traffic and safety concerns since a portion of a bridge on Interstate 85 collapsed in a fire March 30. Officials have set a June 15 deadline for the bridge repair work to be completed, but that is after the 2016-17 school year has ended. Hall Superintendent Will Schofield told school board members at a meeting Monday night that the district reviewed and put a hold on all field trips to the downtown Atlanta area.