Safe Sight Distance
| ||
---|---|---|
Operating Speed
(miles per hour)
|
Left
(feet)
|
Right
(feet)
|
20
|
130
|
130
|
30
|
220
|
260
|
40
|
380
|
440
|
50
|
620
|
700
|
Table 12.2-1. Minimum Standards for Corner Clearance
| |||
---|---|---|---|
Minimum Corner Clearance
| |||
Access Type
|
Intersection Signalized
(feet)
|
Intersection Unsignalized
(feet)
| |
Low volume
|
150
|
50
| |
Medium volume
|
150
|
50
| |
High volume
|
500
|
250
| |
Special case
| |||
Right turn in only
|
50
|
50
| |
Right turn out only
|
100
|
50
| |
Right turn in or out only
|
100
|
50
|
Table 12.2-2. Minimum Access Spacing
| |||||
---|---|---|---|---|---|
Minimum Spacing to Adjacent Access by Access Type2 (Dsp)3
| |||||
Access Type
|
Minimum Spacing to Property Line (Dpl)1
(feet)
|
Medium
(feet)
|
High w/o RT*
(feet)
|
High w/RT**
(feet)
|
Special Case
(feet)
|
Low volume
|
5
| ||||
Medium volume
|
10
|
75
| |||
High volume (w/o RT)*
|
75
|
75
|
150
| ||
High volume (w/RT)**
|
75
|
75
|
250
|
500
| |
Special case
|
10
|
75
|
75
|
75
|
40***
|
1
|
Dpl measured from point of tangency of access to projection
of property line on roadway edge.
|
2
|
For two more accesses serving a single parcel or from a proposed
access from an existing access.
|
3
|
Dsp measured from point of tangency of access to point of tangency
of adjacent access.
|
*
|
High-volume access without right-turn channelization.
|
**
|
High-volume access with right-turn channelization
|
***
|
Right-turn-in-only upstream of right-turn-out-only. Right-turn-out
followed by right-turn-in not allowed.
|
Table 12.2-3. Street Design Guidelines
| ||||||
---|---|---|---|---|---|---|
Type of Street
| ||||||
Description
|
Arterial
|
Collector
|
Minor
|
Private Rights-of-Way
|
Industrial/ Commercial
| |
Minimum right-of-way width (feet)
|
80
|
50
|
50
|
50
|
60
| |
Minimum traveled way width (feet)
|
44
|
24
|
20
|
18
|
30
| |
Minimum width of shoulders (each side) (feet)
|
5
|
3
|
3
|
3
|
9
| |
Sidewalk width (feet)
|
8
|
5
|
5
|
3
|
8
| |
Minimum grade
|
0.5%
|
0.5%
|
0.5%
|
0.5%
|
0.5%
| |
Maximum grade*
|
5%
|
6%
|
8%
|
8%
|
5%
| |
Minimum center-line radius (feet)
| ||||||
Without super elevation
|
500
|
280
|
280
|
175
|
400
| |
With super elevation
|
350
|
175
|
175
|
110
|
300
| |
Roadway crown**
|
1/4"/ft
|
1/4"/ft
|
1/4"/ft.
|
1/4"/ft.
|
1/4"/ft.
| |
Minimum angle of street Intersections****
|
90°
|
90°
|
75°
|
75°
|
90°
| |
Maximum grade within 75 feet of intersection
|
3%
|
3%
|
3%
|
N/A
|
3%
| |
Minimum curb radii at intersections (feet)
|
30
|
25
|
20
|
20
|
30*****
| |
Minimum ROW radii at intersections (feet)
|
20
|
10
|
10
|
10
|
20
|
*
|
Maximum grade may be exceeded for a length of 100 feet or less.
|
**
|
Roadway crown is per foot of lane width.
|
***
|
Gravel surfaces shall have a minimum crown of 3/4 inch per foot
of lane width.
|
****
|
Street intersection angles shall be as close to 90° as feasible
but no less than the listed angle.
|
*****
|
Should be based on turning radii of expected commercial vehicles,
but no less than 30 feet.
|
Design Speed
(miles per hour)
| ||||
---|---|---|---|---|
20
|
25
|
30
|
35
| |
Stopping sight distance (feet)
|
125
|
150
|
200
|
250
|
Stopping sight distance shall be calculated with a height of
eye at 3 1/2 feet and the height of object at 4 1/4 feet.
|
Posted Speed Limit
(miles per hour)
| |||||||
---|---|---|---|---|---|---|---|
25
|
30
|
35
|
40
|
45
|
50
|
55
| |
Sight distance (feet)
|
250
|
300
|
350
|
400
|
450
|
500
|
550
|
Table 12.2-4. Minimum Pavement Materials Thickness
| ||||||
---|---|---|---|---|---|---|
Street Materials
|
Arterial
(inches)
|
Collector
(inches)
|
Minor
(inches)
|
Private Right-of-Way
(inches)
|
Industrial/Commercial
(inches)
| |
Aggregate subbase course (maximum-sized stone 6")
| ||||||
Without base gravel
|
24
|
18
|
18
|
15
|
24
| |
With base gravel
|
20
|
15
|
15
|
12
|
20
| |
Crushed aggregate base course (if necessary)
|
4
|
3
|
3
|
3
|
4
| |
Hot bituminous pavement
| ||||||
Total thickness
|
3
|
3
|
3
|
N/A
|
4
| |
Surface course
|
1 1/4
|
1 1/4
|
1 1/4
|
N/A
|
1 1/4
| |
Base course
|
1 3/4
|
1 3/4
|
1 3/4
|
N/A
|
2 3/4
| |
Surface gravel
|
N/A
|
N/A
|
N/A
|
3
|
N/A
|
Table 12.2-5. Aggregate Subbase Grading Requirements
| |
---|---|
Sieve Designation
|
Percentage by Weight Passing Square Mesh Sieves
|
1/4 inch
|
25% to 70%
|
No. 40
|
0% to 30%
|
No. 200
|
0% to 7%
|
Table 12.2-6. Base Course Grading Requirements
| |
---|---|
Sieve Designation
|
Percentage by Weight Passing Square Mesh Sieves
|
1/2 inch
|
45% to 70%
|
1/4 inch
|
30% to 55%
|
No. 40
|
0% to 20%
|
No. 200
|
0% to 5%
|
Table 12.2-7. Surface Gravel Grading Requirements
| |
---|---|
Sieve Designation
|
Percentage by Weight Passing Square Mesh Sieves
|
2 inch
|
95% to 100%
|
1/2 inch
|
30% to 65%
|
No. 200
|
7% to 12%
|
Table 12.4-1. Culvert Size and Thickness Material
| ||
---|---|---|
Inside Diameter
(inches)
|
Galvanized CMP
Aluminum/Zinc Coated CMP
Corrugated Aluminum Alloy
|
Aluminum Coated CMP
Polymer-Coated CMP
|
15 to 24
|
14 ga.
|
16 ga.
|
30 to 36
|
12 ga.
|
14 ga.
|
42 to 54
|
10 ga.
|
12 ga.
|
60 to 72
|
8 ga.
|
10 ga.
|