§ 151.251 CURVES.
   (A)   Where there is curvilinear horizontal alignment utilized for subdivision streets, the minimum centerline radius to be used shall be as indicated below.
 
Land access/local streets
100 feet
Collector street
150 feet
Arterial street
301.56 feet, dc = 19° 00' 00"
 
   (B)   If reverse curves are utilized and the radii are less than 300 feet, a tangent at least 100 feet long should be introduced between the curves on collector streets and arterial streets.