Table 1 Street Design Guidelines

Table 1 Street Design Guidelines

Description Terrain
Terrain Classification Level Rolling Hilly
Right of way (ft) Section 131-67.A.(1)
Pavement width (ft) Section 131-67 .C.(1)
Type of Curb Section 131-67 .C.(2)
Minimum sight distance1 (ft) 200 150 150
Maximum grade2 6% 9% 11%
Minimum cul-de-sac radius See Detail #4
Cross-Slope 2% 3% 4%
Design Speed 25 25 20
Minimum centerline radius
4 Percent Superelevation
Without Superelevation

150
200

150
200
125
150
Minimum tangent- Between
reverse curves (ft)
4 Percent Superelevation
Without Superelevation
100
75
100
75
100
50
Driveways Section 131-67.C.(9)

1 For sight distance calculations, the height of the driver’s eye is considered to be 3.5 feet and the height of object 2.0 feet
2 The maximum longitudinal length of grades in excess of 6% shall be 1,500 feet. However, such sections of road shall be separated by a minimum of 400 feet at a grade of 6% or less.