Section 257.640 - No-passing zones; determination; signs or markings; traffic control devices; violation as civil infraction(1) The state highway commission and county road commissions shall determine those portions of a highway under their jurisdiction where overtaking and passing or driving to the left of the roadway would be especially hazardous, and by appropriate signs or markings on the roadway shall indicate the beginning and end of those zones in a manner enabling an ordinary observant driver of a vehicle to observe the directions and obey them. A sign shall be placed to the left of the highway on those portions of a highway where additional notice is considered necessary.(2) The no-passing zones provided for by this section shall be based upon a traffic survey and engineering study. Traffic-control devices installed pursuant to this section shall conform to the state manual and specifications as provided for by section 608.(3) A person who fails to obey the traffic-control devices installed pursuant to this section is responsible for a civil infraction.1949, Act 300, Eff. 9/23/1949 ;--Am. 1959, Act 230, Eff. 3/19/1960 ;--Am. 1965, Act 275, Imd. Eff. 7/21/1965 ;--Am. 1970, Act 120, Imd. Eff. 7/23/1970 ;--Am. 1971, Act 224, Imd. Eff. 12/30/1971 ;--Am. 1978, Act 510, Eff. 8/1/1979.