Mo. Rev. Stat. § 300.130
Current with changes from the 2023 Legislative Session
The city traffic engineer shall place and maintain traffic control signs, signals, and devices when and as required under the traffic ordinances of the city to make effective the provisions of said ordinances, and may place and maintain such additional traffic control devices as he may deem necessary to regulate traffic under the traffic ordinances of the city or under state law or to guide or warn traffic.
§ 300.130, RSMo