In accordance with the provisions of Chapter 320, and when signs are erected giving notice thereof, it shall be unlawful for any person to drive a vehicle at a speed in excess of the speeds listed below on the streets as designated.
A. 
The operation of a vehicle at a speed in excess of the following (posted speed limits) shall be considered evidence of driving at a rate of speed which is not reasonable, careful, prudent and lawful, and considered dangerous to person, property, life and limb:
Ord. No.
Street
Speed Limit
22.230; 250; 264; 280; 509; 797
Locust Street (Highway 127), between Highland Street and Lexington Street
20
368
Highway 127, from the south City limit north to Willa Street
Highway 127, from Willa Street to Highland Street
45
30
465
Highway 40, from the west City limits to the eastbound I-70 off ramp
30
465
Highway 40, from the east City limits to approximately 1,400 feet east of Highway 127
30
496
Main Street between Locust Street and the west end of Main Street
20
496
Mulberry Street between Ray Street and Bruns Street
Highway 127, Lexington Street to north City limits
20
30
B. 
The Board of Aldermen of the municipality aforesaid, is hereby authorized to establish and post (except on State and Federal marked highways and then only when approved by the State Highway Commission) critical zones of hazard where the foregoing declared speeds are considered hazardous to person, property, life and limb, any may post a reduced prima facie speed limit not more than ten (10) miles per hour less than the existing speed limits so declared under Chapter 320, Speed Regulations, in this Code.