- c.Curb returns shall be designed by the "plane method"; see City of Palmdale Standard Plan No. G-4.
- d.Standard cul-de-sacs are required for all permanent dead-end streets and may be required for temporary dead-end streets if future development seems remote. The following are recommended maximum lengths of cul-de-sacs.
- 500 feet in length when serving land zoned for industrial or commercial.
- 700 feet in length when serving land zoned for residential uses having a density of more than four dwelling units per net acre.
- 1000 feet in length when serving land zoned for residential uses having a density of four or less dwelling units per acre.
- Vertical Curves:
- The minimum length of vertical curves will be governed by the Algebraic Grade Differential as noted in the table below:
| Algebraic Difference
In Grades (% | Minimum Length
Local | Vertical Curve (ft)
Major/Secondary |
|---|
| 0.50 & Less | Not Required | not Required |
| 0.51-1.00 | Not Required | 80' |
| 1.01-2.00 | 60' | 80' |
| 2.01 & Greater | 100' | 120' |
In addition to the previous table, the minimum length of vertical curves shall comply with current Los Angeles County Public Works Department Standards (refer to 1972 Los Angeles County Road Department Design Manual). The minimum length of crest vertical curves shall be governed by passing sight distance, if appropriate (Plate 2.5 - 01), or by stopping sight distance (Place 2.5 - 02). The minimum length of sag vertical curves shall be governed by Headlight Sight Distance (Plate 2.5 - 03).
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