Engineering Design Standards (PDF) - City of Southfield

2. Minimum surface grade for asphalt paving shall be one (1.0%) percent.
Minimum surface grade for concrete paving shall be six-tenths (0.6%) of
an inch.
C. CITY PUBLIC RIGHT-OF-WAY:
1. A cross section of all off-site paving is required. Minimum requirements
are dependent on the type of existing pavement as follows:
- Concrete major thoroughfare and collector roads require nine (9”) inches
of PC concrete on sand sub-base;
- Asphalt major thoroughfare and collector roads require eight (8”) inches
of asphalt;
- Concrete local roads generally require seven (7”) inches of PC concrete
sand sub-base;
- Asphalt local roads generally require three (3”) inches of asphalt on an
eight (8”) inch gravel base;
- Requirements for existing gravel roads will be considered on an
individual basis by the City Engineering Division.
2. Six (6”) inch concrete curb and gutter is required on all approaches.
3. Passing lanes, acceleration lanes and tapers, and deceleration lanes and
tapers will be required in accordance with the current Road Commission
for Oakland County specifications and guidelines. If curb is required on
the passing acceleration, or deceleration lanes, it shall be six (6”) inch
concrete curb and gutter.
/Forms/Site Plan Design Standards 10-01-07 Revision)
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