The driver of a vehicle on a street or highway upon meeting or overtaking from either direction any school bus which has stopped on the highway for the purpose of receiving or discharging school children shall stop the vehicle before reaching such school bus when there is in operation on the bus a visual signal as required by the statute for operation while the bus is transporting pupils; provided, that the driver of a vehicle upon a street or highway of which the roadway for traffic moving in opposite directions are separated by a strip of ground which is not surfaced or suitable for vehicle traffic need not stop his vehicle upon meeting or passing a school bus which is on the opposite roadway. (Ord. 8-1958 § 3.37, 1958)