(a) The driver of a vehicle upon meeting or overtaking from either direction any school bus which has stopped on the street for the purpose of receiving or discharging any school children, and whose driver has in the manner prescribed by law given the signal to stop, shall stop the vehicle before reaching such school bus and shall not proceed until such school bus resumes motion, or until signaled by its driver to proceed.

    (b) Every bus used for the transportation of school children shall bear upon the front and rear thereof a plainly visible sign containing the words "School Bus" in letters not less than eight (8) inches in height. Each bus shall have lettered on the rear in plain and distinct type the following: "State Law: Stop While Bus Is Loading and Unloading." Each school bus shall be equipped with a mechanical or electrical signalling device, which will display a signal plainly visible from the front and rear indicating intention to stop.

(Code 1964, § 12.290)

     State law reference(s)--Similar provisions, RSMo. § 304.050(1), (2).