Although a plan to close Campus Drive this summer has drawn sharp criticism from on- and off-campus groups, administrators have said changing the plan could conflict with the spirit of the trial. The experiment, which calls for Campus Drive to be closed to traffic except emergency vehicles and two internal bus routes from June 19 to Aug. 13, was formed to allow the university to test the goals of its Facilities Master Plan as it prepares an updated version, Vice President for Administrative Affairs Ann Wylie wrote in an e-mail. Although Associate Vice President for Facilities Management Frank Brewer said...