IOWA CITY — Discretionary busing has not reached its stop just yet.School Board members voted unanimously Tuesday night to maintain discretionary busing in the Iowa City Community School District until criteria are developed to determine which routes can safely be eliminated.“We’ve tried to do this in the past and it’s not a simple exercise, so I would think it would be a multi-month process,” said board President Chris Lynch.The district is required by Iowa law to provide busing for students who live more than 2 miles from their elementary school and 3 miles from their high school.