Table 4.6. Minimum Vertical Grades for Roadways where Drainage Spread is a Consideration
Type of Facility
Minimum Grade (%)
Desirable
Minimum
Industrial Roadways with Curb and Gutter
Local Urban Streets with Curb and Gutter
Urban Collectors with Curb and Gutter
Urban Arterials with Curb and Gutter
Urban Freeways or Limited Access Facilities
0.30
0.50
0.20