Table 6-1
| ||||
---|---|---|---|---|
Flexible Street Paving Options
| ||||
Flexible Pavement Types
|
Pavement Courses
|
Street Type
| ||
Local Street, Alley, or Special Purpose Street
(inches)
|
Collector
(inches)
| |||
Option No. 1
|
Wearing(1)
|
1 1/2
|
1 1/2
| |
Binder(2)
|
0
|
2
| ||
Base(3)
|
4 1/2
|
4
| ||
Subbase
|
8
|
8
| ||
Wearing(1)
|
1 1/2
|
1 1/2
| ||
Option No. 2
|
Binder(2)
|
2
|
2
| |
CABC(4)
|
6
|
8
| ||
Subbase
|
8
|
8
|
NOTES:
| ||
---|---|---|
(1)
|
Wearing: Superpave Asphalt Mixture Design, HMA Wearing Course,
PG 64-22, 0.0 to 0.3 million ESALs, 9.5 mm mix, SRL L.
| |
(2)
|
Binder: Superpave Asphalt Mixture Design, HMA Binder Course,
PG 64-22, 0.0 to 0.3 million ESALs, 19.0 mm mix.
| |
(3)
|
Base: Superpave Asphalt Mixture Design, HMA Base Course, PG
64-22, 0.0 to 0.3 million ESALs, 25.0 mm mix.
| |
(4)
|
CABC: crushed aggregate base course.
|
Table 6-2
| |||
---|---|---|---|
Vertical Alignment Values
| |||
Design Speed
(in miles per hour)
|
K Crest Vertical Curves
|
K Sag Vertical Curves
| |
20
|
10
|
20
| |
25
|
20
|
30
| |
30
|
30
|
40
| |
35
|
45
|
50
| |
40
|
70
|
70
| |
45
|
100
|
90
| |
50
|
150
|
110
| |
55
|
220
|
130
|
SSSD = 1.47 Vt + V2/30 (f+G)
|
Where:
| ||||
SSSD
|
=
|
Minimum safe stopping sight distance (feet).
| ||
V
|
=
|
Speed of vehicle in miles per hour.
| ||
t
|
=
|
2.5 seconds (perception/response time of driver).
| ||
f
|
=
|
0.3 (wet pavement friction).
| ||
G
|
=
|
Roadway grade in percent divided by 100 (positive for upgrade,
negative for downgrade).
|
Table 6-3
| |||
---|---|---|---|
Cartway and Right-of-Way Standards
| |||
Street Classification
|
Minimum Cartway Width
(feet)
|
Minimum Right-of-Way Width
(feet)
| |
Principal arterial street
|
As determined after consultation with the Township, LCPC, and
PennDOT
| ||
Minor arterial street
|
As determined after consultation with the Township, LCPC, and
PennDOT
| ||
Collector street
|
36 w/ curb
|
60
| |
Local street with on-street parking
|
36 w/ curb
|
50
| |
Local street without on-street parking
|
28 w/ curb
|
50
| |
Cul-de-sac turnaround
|
80 in diameter
|
100
| |
Alley or special purpose street
|
12
|
20
|
Table 6-4
| ||
---|---|---|
Access Drive Standards
| ||
Number of Lanes
|
Minimum Cartway
(feet)
| |
3
|
36(1)
| |
2
|
24(1)
| |
1
|
12(1)
|
NOTES:
| ||
---|---|---|
(1)
|
Parallel parking may be permitted along one side of access drives,
provided that the required width is increased by eight feet.
|
Table 6-5
| ||
---|---|---|
Street Trees: Recommended Species
| ||
Common Name
|
Botanical Name
| |
Red maple
|
Acer rubrum cultivars
| |
Red horsechestnut
|
Aesculus x carnea
| |
American yellowwood
|
Cladrastis lutea
| |
Ginkgo
|
Ginkgo biloba (males only)
| |
Thornless honey locust
|
Gleditsia triacanthos inermis cultivars
| |
Sweetgum
|
Liquidambar styraciflua
| |
Black tupelo
|
Nyssa sylvatica
| |
Sawtooth oak
|
Quercus acutissima
| |
Willow oak
|
Quercus phellos
| |
Red oak
|
Quercus rubra
| |
Japanese pagoda tree
|
Sophora japonica
| |
Littleleaf linden
|
Tilia cordata
| |
Crimean linden
|
Tilia x euchlora
| |
Silver linden
|
Tilia tomentosa
| |
Japanese Zelkova
|
Zelkova serrata cultivar
|