A. The length of installation should be approximately twelve feet from the beginning of rise from the pavement surface to return to the pavement surface;

B. Undulations should be approximately four inches in height at the highest point and a circular arc surface should be used from point of rise to the end of the undulation. Undulations approximately three inches in height can also be used;

C. Undulations should be placed approximately six hundred to seven hundred feet apart with minimum distance being approximately four hundred feet;

D. Warning signs should be posted providing notice of the undulations;

E. Undulations should be tapered from zero elevation at the gutter to the full undulation height approximately two to three feet from the gutter. Where rolled curb is used, it may be necessary to place vertical posts on the sidewalk to prevent motorists from driving on it to bypass the undulations. These posts should have high visibility during both day and night time conditions;

F. In order for a street to be eligible for consideration for installation of undulations, a petition should be submitted to the city’s traffic engineer showing a majority (preferably sixty-five percent plus) of the residents along the route being in favor of the installation of the undulations;

G. Vehicular speeds should be greater than or equal to ten miles per hour (eighty-five percent) over the speed limit or advisory speed along routes where undulations are desired;

H. Volumes of vehicular traffic should be greater than three hundred vehicles per day but less than three thousand vehicles per day along routes where undulations are desired;

I. Streets where undulations are installed should be no more than two lanes wide;

J. Streets where undulations are installed should not be important access routes for emergency vehicles;

K. Grades where undulations are installed should be less than five percent and not on curves; and

L. Streets where undulations are installed should not be major truck or transit routes. (Ord. 1597-89 § 2, 1989.)