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DESIGN SPECIFICATIONS (as amended by Ordinance # 18,055)
Design
Principal
Minor
Minor
Consideration
Expressway
Arterial
Arterial
Collector
Res. j
Res.
Design speed
55
45
40
30
25 20
(miles per hour)
Maximum grade
8%
8%
9%
12%
15% 16.%*****
at centerline
Min. sight
550'
400'
325'
200'
200' 200'
distance at
crest of
vertical curve
Min. horizontal
1700'
900'
600'
275'
150' 75'**
radius at centerline
(normal crown)
Min. horizontal
1000'
500'
500'
235'
NIA NIA
radius at centerline
(super -elevated
Cross-section)
`
Min. horizontal
600'
300'
200'
100'
50' NIA
tangent distance
bet. reverse
curves
Service volume
40,000
25,000
18,000
5,000
I
2,500 Max. of
(max. vehicles
35 lots
per day)
Min. right-of-way
200'
110'
90'
60'
50' 45'
Min. pavement
48'+shld
66'****
59'
36'
26' 24'
width (back to
& median
back of curb)
Sidewalks
may be***
both
both
one
one None
required
sides
sides
side
side
NOTE. A71 minimum design standards comply with
�� 1984 AASHTO Policy Design Manual
* Carrespon200 ft.'h:orixontal tangent distance between reserve curves -
Minimum standard corresponds to design speed of 15 mph
*** ,Sidewalks may be required in areas of intense development
**** 2 divided 26 ft. lanes with properprovision forfuture widening.
***** may be increased. to 18% with approval.
# No more than 35 lots.