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NMD Road Designation |
Maintenance responsibility |
Street Design Criteria |
Application |
Description |
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Max. design speed (mph) |
Traffic flow |
Total number of lanes |
Paved width min. fc-fc (ft) |
Lane width (ft) |
Bike lane width (ft) |
Parking lane width (ft) |
Planted median min. width (ft) |
Planting strip min. width (ft) |
Sidewalk minimum width |
Curb |
Rght-of-way min. width (ft) (note "I") |
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Residential (ft) |
Commercial (ft) |
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Boulevard |
Public or Private |
30 |
2-way |
4 |
Varies |
11 - 12 |
4 |
6 |
6 |
6 |
5 |
12 - 18 |
Y |
Varies |
Centers and where a "seam" is created between adja-cent neighborhoods |
Multi-lane thoroughfare that may include a center median to create linear
park appearance. Bike lanes are generally provided. Parking lanes may be
separated from the travel lanes with medians on both sides. See notes A and
B. |
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Avenue |
Public or Private |
25 |
2-way |
2 |
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10 - 12 |
4 |
6 |
6 |
6 |
5 |
12 - 18 |
Y |
64 - 68 |
Centers and General Areas |
Two-lane thoroughfares that connect to important places/spaces in the
Center, may serve mixed use areas, function as a "main" street or secondary
to a "main" street. Parking lanes are provided and diagonal parking may be
allowed with the appropriate width. Bikes lanes are generally provided
unless determined not applicable. Avenues may include a center median to
create linear park appearance. See notes A, B and C. |
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Street |
Public or Private |
20 - 25 |
2-way |
2 |
30 - 32 |
na |
4 (C) |
6 (D) |
na |
6 |
5 |
na |
Y |
54 - 56 |
Edge, General Areas, Centers & Transitions from residential to mixed-use
areas |
Neighborhood "Street"; local slow-movement thoroughfare that is urban in
character and the street is considered a "shared" space. On-street parking
is permitted (intermittent or delineated). See notes A, C, and D. |
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Lane |
Public or Private |
20 |
2-way |
2 |
22 (pking one side) ------------ 28 (pking two sides) |
na |
na |
na |
na |
6 |
5 |
na |
Y |
46 - 52 |
Edges and General Areas; on limited basis in Centers |
Narrow very slow-traffic street where "yield" movements intended and the
street is considered a "shared" space. Intermittent on-street parking is
permitted. See notes A, E, F, G and H. |
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Alley - Residential |
Private |
na |
2-way |
1 |
12 |
na |
na |
na |
na |
na |
na |
na |
N |
20 |
Edges and General Areas |
Narrow accessways at the rear of residential lots to garages or designated
parking; "yield" movements intended. Right-of-way or easement width
reductions may be considered in accordance with Code 14-512F. The
base-stone of the driving surface shall be extended at least 12" beyond edge
of pavement to prevent edge failure; further extension to support the
shoulder areas is recommended. |
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Alley - Commercial |
Private |
na |
2-way |
1 |
18 |
na |
na |
na |
na |
na |
na |
na |
Y |
20 |
Centers |
Narrow accessways at the rear of lots to service areas; "yield" movements
intended. Accessways are curbed unless pavement extends to the walls of
adjacent structures. |
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Limitation Notes: |
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Definitions: |
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A. The characteristics of the urban streetscape and influence of
pedestrian/bike traffic will encourage slow speeds. |
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Shared Space - |
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B. Commercial sidewalk street trees are planted within tree grates in lieu
of planting strips. |
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street width is shared by vehicles, bicycles and pedestrians. |
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C. Streets with adt > 3000 shall delineate bike lanes and parking lanes
(based on "DISC - Final Report"). Under 3000 adt the street is "shared
space". |
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D. The parking lane width on "Streets" where striping is applicable (per
"C") or desired. |
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Center, General, and Edge Areas - |
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E. May be accepted as a public street if 3rd offstreet parking space is
accommodated. |
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Elements of the neighborhood model that comprise the "Transect Concept" |
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F. Shall terminate at a "T" intersection, with a higher category street,
within no more than 2 continuous blocks. |
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and are described in detail in "The Development Area Initiatives Project - |
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G. Block lengths shall be as follows for each NMD area: Center 200' - 300'
; General Areas 300' - 400' ; Edge Areas 400' - 600'. |
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Volume 1 of the Final Report", Section 3, "Fitting the Pieces Together" |
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H. At intervals not exceeding 200 ft., hydrants, alley or share driveway
entrances, or other "no parking" areas will be matched on both sides of
the |
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(pgs. 29 - 36). |
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street to assure a 20 ft. wide zone to operate fire/emergency
equipment. |
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I. The minimum right-of-way width is measured to a point 12 inches behind
residential area sidewalks and 12 feet from the face of |
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Intermittent On-street Parking - |
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curb along commercial area sidewalks. |
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On-street parking that is not required by Code and is random and
discontinuous |
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along one or both sides of the street. |
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