In cases of emergency and when public safety may so require, the Chief of Police is authorized and empowered to make special rules and regulations governing traffic for a limited time, and the Chief of Police is authorized in cases of emergency or unusual conditions to designate parking places in addition to those set out in this Traffic Code, and to prevent parking in any portion of the parking places in this Traffic Code specified for so long a time as such emergency or unusual conditions may make necessary.
(1961 Code Sec. 303.01)