C.M.R. 02, 385, ch. 850, app 385-850-B
Roadways
A. Minimum thickness of material after compaction
| Street Materials | Minimum Requirements |
| Aggregate sub-base course (Max sized stone 4") | 12 inches1 |
| Crush aggregate base course | 3 inches |
B. Before clearing has started on a community street, the center and side lines of the new street shall be staked or flagged at fifty foot intervals.
C. It is recommended that before grading is started, the entire community street shall be cleared of all stumps, roots, brush, and other objectionable material. All ledge, large boulders and tree stumps shall be removed from the community street.
D. All organic materials shall be removed to a depth of two feet below the subgrade of the street. Rocks and boulders shall also be removed to a depth of two feet below the subgrade of the roadway. On soils which have been identified as not suitable for roadways, the subsoil shall be removed from the street site to a depth of two feet below the subgrade and replaced with material meeting the specifications for gravel aggregate sub-base below. The subgrade shall be sloped to provide proper drainage.
E. Except in a ledge cut, set slope shall be no steeper than a slope of three feet horizontal to one foot vertical, and shall be graded, loomed, limed, fertilized, and seeded according to the specifications of the erosion and sedimentation control plan.
F. It is suggested, when possible, that all underground utilities be placed behind the homes, however, those installed under streets shall be installed prior to paving to avoid cuts in the pavement. It is recommended that building sewers and water service connections shall be installed to the edge of the community street prior to paving.
G. The aggregate sub-base course shall be sand or gravel of hard durable particles free from vegetation matter, lumps or balls of clay and other deleterious substances. The gradation of the part that passes a 4 inch square mesh sieve shall meet the following grading requirements:
| Sieve Designation | Percentage by Weight Passing Square Mesh Sieves |
| 1/14 inch | 25-70% |
| No. 40 | 2-30% |
| No. 200 | 1-7% |
H. Aggregate for the sub-base shall contain no particles of rock exceeding four inches in any dimension.
I. The aggregate base course shall be sand or gravel of hard durable particles free from vegetative matter, lumps or balls of clay and other deleterious substances. The gradation of the part that passes a 3 inch square mesh sieve shall meet the following grading requirements:
| Sieve Designation | Percentage by Weight Passing Square Mesh Sieves |
| 1/2 inch | 45-70% |
| 1/14 inch | 30-55% |
| No. 40 | 5-20% |
| No. 200 | 1-5% |
J. Aggregate for the base shall contain no particles of rock exceeding three inches in any dimension.
K. Pavement joints. Where pavement is used and joins an existing pavement, the existing pavement shall be cut along a smooth line and form a neat, even, vertical joint.
L. Pavements. It is recommended, if pavement is used, that minimum standards for the base layer of pavement shall be the Maine Department of Transportation specifications for plant mix grade B with an aggregate size no more than 1 inch maximum. It is recommended that minimum standards for the surface layer of pavement shall meet the MDOT specifications for plant mix grade C with an aggregate size no more than 3/4 inch maximum.
M. Roadway Width and Grade. The traveled width of a one-way street shall be a minimum of 12 feet. The traveled width of a two-way street shall be a minimum of 18 feet. If the road is paved, there shall be adequate shoulders to support the pavement. The roadway grade shall not exceed 10%.
Footnote:
(1) The 12" aggregate base is in most instances not acceptable for municipal streets. If your long range plan is to have your community streets accepted as public ways, you should check with your municipality. Most municipalities require at least 18" aggregate subbase.
Intersections
A. Grades of all streets shall conform to the terrain so that cut and fill are minimized.
B. Where community streets intersect with public roads, recommended sight distances, as measured along the public way which traffic will be entering, and based upon the legal speed limit, are as follows:
| Legal Speed Limit (mph) | 25 | 30 | 35 | 40 | 45 | 50 | 55 |
| Sight distance (feet) | 250 | 300 | 350 | 400 | 450 | 500 | 550 |
C. Sight distances shall be measured from the driver's seat of a vehicle standing on that portion of the exit with the front of the vehicle at the stop line of the community street, with the height of the eye 31/2 feet, to the top of an object 41/2 feet above the pavement.
D. When necessary, corner lots shall be cleared of all growth and sight obstructions, including ground excavation, to achieve the required visibility.
C.M.R. 02, 385, ch. 850, app 385-850-B