Application of no passing zone markings (Repealed)

On a two-lane highway the no passing marking shall be parallel to and extended along the centerline throughout the no passing zone. In addition to the pavement markings here prescribed, no passing zone signs may be used to emphasize the existence of a no passing zone. The no passing marking shall also be used on two-way roadways at pavement width transitions and on approaches to obstructions which must be passed on the right. It shall also be used on approaches to railroad grade crossings. It may also be used at other locations where passing should be prohibited.