The department shall enforce the provisions of this chapter and govern the conduct of companies and drivers operating under this chapter. With the approval of the mayor and upon notice to the city council, the department director may waive or temporarily impose restrictions not addressed in this chapter or department rules and regulations if it is determined that circumstances in the city exist that create congestion, security concerns, emergency conditions, or other operational problems, and that a temporary suspension or modification of ordinances is in the best interests of the city to address such circumstances. If the city council does not act within sixty (60) days to approve or disapprove the action, then the action is deemed approved. Waivers issued prior to the effective date hereof shall be valid through the earlier of: a) the expiration date of such waiver; or b) June 30, 2015. (Ord. 67-14, 2014)