A. Twenty Five Miles Per Hour: No vehicle shall be driven at a greater speed than twenty five (25) miles per hour in the City except:
1. On designated and numbered State and Federal highways, the maximum is as posted;
2. Emergency vehicles being lawfully driven as provided in this Code;
3. When a different speed limit is otherwise designated and posted; or
4. When a different speed limit is established in this Code.
B. Reduction, Increase; Signs Posted: City personnel, subject to such direction as the Mayor and City Council may give by motion or resolution, may reduce or increase the speed limits provided in this Code, and when he does so, appropriate signs shall be placed on such streets or parts of streets indicating the lower or higher speed limit. (1988 Code § 15-401)