Description
|
Type of Street
| |||||
---|---|---|---|---|---|---|
Minor Local, 5 Units or 80 ADT
|
Local Residential, 51 to 250 ADT
|
Collector, 251 to 1,000 ADT
|
Arterial, >1,000 ADT
|
Industrial/
Commercial
| ||
Minimum right-of-way width
|
50 feet
|
50 feet
|
60 feet
|
80 feet
|
80 feet
| |
Minimum pavement/gravel width
|
16 feet
|
22 feet
|
24 feet
|
28 feet
|
36 feet
| |
Sidewalk width, one side of the street
|
N/A
|
5 feet
|
5 feet
|
5 feet
|
5 feet
| |
Minimum grade
|
0.5%
|
0.5%
|
0.5%
|
0.5%
|
0.5%
| |
Maximum grade
|
8%
|
6.0%
|
6.0%
|
5.0%
|
5.0%
| |
Minimum center-line radius
|
N/A
|
150 feet
|
230 feet
|
800 feet
|
800 feet
| |
Minimum tangent between curves of reverse alignment
|
N/A
|
100 feet
|
200 feet
|
300 feet
|
800 feet
| |
Roadway crown
|
N/A
|
1/4 inch per foot
|
1/4 inch per foot
|
1/4 inch per foot
|
1/4 inch per foot
| |
Minimum angle of street intersections
|
N/A
|
60°
|
60°
|
90°
|
90°
| |
Maximum grade at intersection (within 75 feet
of intersections)
|
N/A
|
2%
|
2%
|
2%
|
2%
| |
Curb radii at intersection 90°
|
N/A
|
15 feet
|
20 feet
|
30 feet
|
30 feet
| |
Minimum property line radii at intersections
|
N/A
|
10 feet
|
10 feet
|
20 feet
|
20 feet
| |
Minimum width of shoulders (each side)
|
2 feet
|
3 feet
|
3 feet
|
3 feet
|
9 feet
|
Minimum Safe Sight Distances
| |||||||
---|---|---|---|---|---|---|---|
Posted Speed Limit
(mph)*
| |||||||
30
|
35
|
40
|
45
|
50
|
55
| ||
Passenger cars
|
300 feet
|
350 feet
|
400 feet
|
450 feet
|
500 feet
|
550 feet
| |
Single-unit trucks
|
415 feet
|
475 feet
|
540 feet
|
600 feet
|
675 feet
|
750 feet
| |
Tractor-trailers
|
530 feet
|
615 feet
|
700 feet
|
840 feet
|
975 feet
|
1,100 feet
|
NOTE: Where it is impossible to meet these sight-distance standards due to physical conditions, a maximum variance of 30% may be permitted, in accordance with the waiver provisions in § 121-8. The thirty-percent variance is consistent with the absolute minimum stopping distance requirements on wet pavements established by the Maine Department of Transportation.
| |
*NOTE: Along existing road, where new street
is to intersect.
|
Street Materials
|
Minimum Requirements
(inches)
| |||||
---|---|---|---|---|---|---|
Arterial
|
Collector
|
Local
Residential
|
Minor Local Street
|
Industrial
Commercial
| ||
Aggregate subbase course (maximum size stone:
4 inches)
|
24
|
18
|
18
|
12
|
24
| |
Crushed aggregate base course
|
4
|
3
|
3
|
3
|
4
| |
Hot bituminous pavement (after compaction)
|
N/A
| |||||
Total thickness (after compaction)
|
5
|
4
|
4
|
N/A
|
5
| |
Surface course (after compaction) (MDOT HMA,
9.5 mm) (3/8 inch) 50 GYR
|
2
|
1 1/2
|
1 1/2
|
N/A
|
2
| |
Base course (after compaction) (MDOT HMA 19.0
mm) (3/4 inch) 50 GYR
|
3
|
2 1/2
|
2 1/2
|
N/A
|
23
|