§ 21.30.070. Thoroughfare standards.  


Latest version.
  • A.

    General.

    1.

    Thoroughfares are intended for use by vehicular and pedestrian traffic and to provide access to lots and open spaces.

    2.

    Thoroughfares shall generally consist of two parts: vehicular lanes and public frontages.

    3.

    Thoroughfares shall be designed in context with the urban 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 shall 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.

    4.

    Within the most rural zones (T1 and T2) pedestrian comfort shall be a secondary consideration of the thoroughfare. Design conflict between vehicular and pedestrian generally shall be decided in favor of the vehicle. Within the more urban transect zones (T3 through T6) pedestrian comfort shall be a primary consideration of the thoroughfare. Design conflict between vehicular and pedestrian movement generally shall be decided in favor of the pedestrian.

    5.

    The thoroughfare network shall be designed to define blocks not exceeding the size prescribed in Table 14c and Table 16c. The perimeter shall be measured as the sum of lot frontage lines. Block perimeter at the edge of the development parcel shall be subject to approval by warrant, if the deviation allowed by the warrant is no more than twenty percent from the standard specified in Table 14c and Table 16c.

    6.

    All thoroughfares shall terminate at other thoroughfares, forming a network. Internal thoroughfares shall connect wherever possible to those on adjacent sites. Culs-de-sac are explicitly discouraged and shall be subject to approval in T2 and T3 by warrant only where there are exceptional topographic conditions that do not allow through connections.

    7.

    Each lot shall enfront a vehicular thoroughfare, except that twenty percent of the lots within each transect zone may enfront a passage. By warrant, lots within each transect zone that enfront both a passage and an Ephemeral Stream shall not be counted towards the twenty percent maximum.

    8.

    Thoroughfares along a designated B-grid may be exempted by warrant from one or more of the specified public frontage or private frontage requirements, if at least one of the requirements specified in Tables 4A, 4B and 7 are met. See Table 4A and Table 7.

    9.

    Reserved.

    10.

    The standards for thoroughfares within special districts shall be determined by city council when the regulating plan is approved, except the airport special districts thoroughfare standards may be determined from Tables 3A, 3B, 4A, 4B and 4C.

    B.

    Vehicular lanes.

    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 3A.

    2.

    A bicycle network consisting of bicycle trails, bicycle routes and bicycle lanes should be provided throughout as defined in Chapter 21.70, Definitions of Terms and allocated as specified in Table 14d. The community bicycle network shall be connected to existing or proposed regional networks wherever possible.

    C.

    Public frontages.

    1.

    General to all zones T1, T2, T3, T4, T4-0, T5, T50, T6 and special districts SDI, SD2, SD3, SD4, SD5, SD6, SD7.

    a.

    The public frontage contributes to the character of the transect zone, and includes the types of sidewalk, curb, planter, bike lanes and street trees.

    b.

    Public frontages shall be designed as shown in Table 4A and Table 4B and allocated within transect zones as specified in Table 14d and special districts as specified in Table 16d.

    c.

    Within the public frontages, the prescribed types of public planting and public lighting shall be as shown in Table 4A, Table 4B, Table 5 and Table 6. The spacing may be adjusted by warrant to accommodate specific site conditions, if it is within a twenty percent deviation.

    2.

    Specific to zones T1, T2, T3.

    a.

    The public frontage shall include native 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, T4-O, T5, T5O, T6.

    a.

    The introduced landscape shall consist primarily of durable species tolerant of soil compaction.

    4.

    Specific to zone T4.

    a.

    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 T4-O, T5, T5O, T6.

    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.

    (Ord. 16945 § 2 (part), 2008)

(Ord. No. 17378, § 1, 8-24-2010; Ord. No. 17542, § 12, 4-26-2011; Ord. No. 17787, § 3, 5-15-2012; Ord. No. 17962, § 3, 3-5-2013)