Notwithstanding the provisions of this chapter, the traffic control regulations promulgated by the Director of Public Service and Safety pursuant to the authority granted herein shall be effective for a period of ninety days. Council may keep any such regulation effective by the adoption of legislation after obtaining, whenever feasible, the recommendation of the Traffic Commission. In addition, Council may override any decision of the Director of Public Service and Safety and may assume any of the powers delegated to the Director. Upon adoption of any such legislation, the same may be changed only by amending or repealing legislation adopted by Council.