Whenever the city traffic engineer anticipates that a walkathon, bikeathon, or construction traffic congestion is likely to result from the natural causes or construction, he or she shall place, or cause to be placed, temporary signs indicating that the operation, parking or standing of vehicles is prohibited on such streets and alleys. Such signs shall remain in place only during the existence of such natural causes or construction and the city traffic engineer shall remove, or cause to be removed, such signs thereafter. (Ord. 98 § 1 (part), 1993: Ord. 3 § 1 (part), 1991: prior code § 12.11.011)