§ 30-55. Thoroughfares.
(a)
Instructions.
(1)
Thoroughfares are intended for use by vehicular and pedestrian traffic and to provide access to lots and civic spaces. Thoroughfares shall generally consist of vehicular lanes and public frontages.
(2)
Thoroughfares shall be designed in context with the physical form and desired design speed of the transect zones through which they pass. The public frontages of thoroughfares that pass from one transect zone to another should be adjusted accordingly or, alternatively, the transect zone may follow the alignment of the thoroughfare to the depth of one lot, retaining a single public frontage throughout its trajectory. See Table 5.
(3)
Pedestrian comfort shall be a primary consideration of the thoroughfare in transect Zones T3 through T5. Design conflict between vehicular and pedestrian movement generally shall be decided in favor of the pedestrian.
(4)
The thoroughfare network shall be designed to define blocks not exceeding the size prescribed in Table 2. The perimeter shall be measured as the sum of lot frontage lines. When more than one type of transect zone of T3, T4, T4O, or T5 exists in one block, the transect zone with the greatest area in the block shall be used to determine the maximum block perimeter. If equal, the lower transect zone number shall control.
(5)
All thoroughfares shall terminate at other thoroughfares, forming a network. Culs-de-sac shall be subject to approval in the regulating plan to accommodate specific site conditions only but are generally discouraged and, if approved, shall not be longer than 150 feet as measured from the center through street to the center of the vehicular turn around.
(6)
Each lot shall front a vehicular thoroughfare, except that 20 percent of the lots within each transect zone may front a cross block passage.
(7)
Designated B-grid streets shall not require compliance with private frontage standards pursuant to Table 14 or frontage buildout pursuant to Table 2f.
(8)
Standards for paths and bicycle trails shall conform to guidelines as outlined in the town comprehensive bike plan.
(9)
Standards for thoroughfares within special districts shall be defined by Table 11.
(b)
Vehicular lanes—General to all Zones T1, T2, T3, T4, T4O, T5.
(1)
Thoroughfares may include vehicular lanes in a variety of widths for parked and for moving vehicles, including bicycles. The standards for vehicular lanes shall be as shown in Table 3.
(2)
A bicycle network consisting of bicycle trails, bicycle routes, bicycle lanes, and multi-use paths should be provided throughout the community. The community bicycle network shall be connected to existing or proposed regional networks wherever possible and as shown in the adopted town comprehensive bicycle plan.
(c)
Public frontages.
(1)
General to all Zones T1, T2, T3, T4, T4O, T5.
a.
The public frontage contributes to the character of the transect zone, and includes the types of sidewalks, curbs, planters, bikeways, lighting, and street trees.
b.
Public frontages should be designed as shown in Tables 5 and 6 and allocated within transect zones as specified in Table 2.
c.
Within the public frontages, the prescribed types of public planting and public lighting shall be as shown in Tables 7 and 8. The spacing may be adjusted up to 20 percent of requirement to accommodate specific site conditions.
d.
Landscape plans shall be prepared for existing and proposed landscape elements in conjunction with the design, development, and construction documents for thoroughfares.
e.
Proposed street tree height and type shall be appropriate for the frontage conditions, with canopy branching height following the clearance requirements outlined in article VI of this chapter. Measurements shall be taken at the bottom of the main canopy.
f.
Trees with existing or potential canopy covering sidewalks, driveways, paths, plazas, alleys, lanes, parking space or street pavements shall be of a type that, at maturity or with minor pruning at installation, provide a clear height of eight feet for sidewalks and paths, 12 feet for driveways and parking spaces, and 15 feet for streets and loading areas, exclusive of tree grates or planting areas with gravel mulch. Evergreen trees shall be 24 inches through 36 inches minimum clear of any sidewalk or pavement edge at the lot line.
(2)
Specific to Zones T1, T2, T3.
a.
The public frontage shall include trees of various species, naturalistically clustered, as well as understory.
b.
The introduced landscape shall consist primarily of native species requiring minimal irrigation, fertilization and maintenance.
(3)
Specific to Zones T4, T4O, T5. The introduced landscape shall consist primarily of durable species tolerant of soil compaction.
(4)
Specific to Zone T4. The public frontage shall include trees planted in a regularly spaced allee pattern of single or alternated species with shade canopies of a height that, at maturity, clears at least one story.
(5)
Specific to Zones T4O, T5.
a.
The public frontage shall include trees planted in a regularly spaced allee pattern of single species with shade canopies of a height that, at maturity, clears at least one story. At retail frontages, the spacing of the trees may be irregular, to avoid visually obscuring the shopfronts.
b.
Streets with a right-of-way width of 40 feet or less shall be exempt from the tree requirement.
(Code 2003, § 31-10; Ord. No. 13-04, § 1(exh. A), 2-21-2013)