1. The grades of streets shall not be less than 0.5 percent, or exceed the following:
A. Primary and secondary thoroughfares, designated as such on the transportation plan, five percent unless prevented by topography;
B. Collector, minor and local streets, service drives, and alleys, ten percent.
C. Pedestrian ways or crosswalks: Not to vary more than three percent from adjoining roadway, unless acceptably designed steps are to be provided.
2. All changes in street grades above one percent shall be connected by vertical curves of a minimum length equal to 30 times the algebraic difference in the rate of grade for thoroughfares and one-half of this minimum for all other streets.
3. The radii of curvature on the centerline shall not be less than the following:
A. Thoroughfares, 350 feet;
B. Local streets, minor streets, service drives and alleys, 150 feet.
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