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City of Milpitas
Engineering Design Guidelines
Street Design

The information and guidelines contained herein are to be used whenever applicable. In the event a development is to be constructed in stages, master utility plans are required prior to submittal of the first stage improvement plans. The master utility plans shall show all improvements, including interim (phased) and ultimate improvements. For information regarding these guidelines contact the Land Development Section of the Engineering Division, at (408) 586-3329.

STREET DESIGN

Street layout shall be designed in conformance with Caltrans Highway Design Manual.  Some factors to be considered are: safety, design speed, type of street, topography, geotechnical features, profile and utilities including drainage.

A.        Design criteria
B.        Streets shall include the following improvements

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A. Design criteria

  1. Minimum curve radii
    Major street-700 feet
    Collector street-400 feet
    Local street-250 feet

  2. Street intersections
    300 feet minimum distance (curb to curb) between street intersections
    150 feet minimum distance (curb to driveway edge) between street intersection and driveways

  3. Street intersection curb radii
    30 feet

  4. Longitudinal slope
    .006 ft/ft (minimum)

  5. Grade Break in vertical curves
    0.5% Max.
    If exceed 0.5%, provide a vertical curve

  6. Minimum length of vertical curves
    50 feet

  7. Minimum length of tangents between centerline curves
    50 feet

  8. Street cross-slope
    2% minimum (typical)
    4% maximum

  9. Cul-de-sac’s length
    1000 feet maximum

  10. Cul-de-sac’s minimum face of curb radius
    Residential- 40 feet
    Industrial-60 feet

  11. Streets ultimate widths*

    Type
    R/W Width   
    Curb Width

    PSUE**
    Major Arterial
    124'
    104'
    10’
    Secondary Arterial
    90’
    70’
    10’
    Collector
    60' 
    40'
    10’
    Local
    56'
    36'
    10’
    Frontage Local
    40' 
    30'
    10’
    Frontage Collector
    44' 
    34'
    10’
    Frontage Industrial
    42' 
    36'
    10’
    Hillside Local
    48'
    32'
    10’
    Hillside Collector
    56'
    36'
    10’
    Hillside Major
    80'
    64'
    10’
    Industrial Major
    80'
    68'
    10’
    Industrial Minor
    60'
    48'
    10’

    *    Excluding additional right-of-way at significant
          intersections to accommodate turning lanes
    **  Both sides of street

  12. Traffic index and pavement section

    Street Classification

    TI*

    Mini. AC
    Thickness (Inch) **

    Mini. Class II
    AB (Inch) **

     

     

     

     

    Local Residential Streets

    6

    4

    6

    Frontage Local

     

     

     

    Local

     

     

     

    Hillside Local

     

     

     

     

     

     

     

    Collector Residential Streets

    8

    4

    6

    Collector

     

     

     

    Hillside Collector

     

     

     

    Frontage Collector

     

     

     

     

     

     

     

    Local Industrial Streets

    9

    6

    6

    Frontage Industrial

     

     

     

    Industrial Minor

     

     

     

     

     

     

     

    Collector Industrial Streets

    10

    6

    6

    Frontage Collector

     

     

     

    Industrial Collector

     

     

     

    Hillside Major

     

     

     

    Secondary Arterial

     

     

     

     

     

     

     

    Major Streets

    11

    6

    6

    Industrial Major

     

     

     

    Major Arterial

     

     

     

     

     

     

     

    Private Streets

    5

    4

    6

     

    * The following criterion can be used to determine a simplified type of street:

    Type Tributary Dwelling Units Traffic Volume
    Local up to 200 less than 1,400 ADT
    Collector 200 to 700 up to 5,400 ADT
    Major excess of  700 greater than 750 vphpl

    NOTE: (VPHPL)-Vehicles per (highest) hour per lane (ADT)-Average daily traffic

    **  The actual depth of AC and AB shall be determined based on soil reports utilizing the State of California Flexible Pavement Design Method.



  13. “R” value
    Base-78 minimum
    Sub-base-50 minimum

B. Streets shall include the following improvements

  1. Asphalt concrete paving on aggregate base
  2. Curb and gutter
  3. Sidewalk with wheel chair ramps
  4. Signs, striping and street name signs
  5. Bus stops (as required)
  6. Driveways serving 2 or more dwelling units shall be constructed to commercial
    driveway standards. Driveways longer than 150' may require turn-around per the Fire Department.
  7. All hillside development will be a special case and require special considerations.