Commercial Shared Street

Many narrow or crowded downtown streets operate informally as shared streets during rush hour or at lunchtime, but are not regulated as such. A commercial shared street environment should be considered in places where pedestrian activity is high and vehicle volumes are either low or discouraged. Commercial shared streets can be designed for narrow or wide cross sections, but become increasingly complex and difficult to maintain as a shared space as width increases.

From 1960–80, many neighborhood main streets and downtown retail corridors were converted to pedestrian-only usage. these conversions were often called “pedestrian malls.” in an era of declining downtown retail revenues due to competition from shopping center developments outside of historic cores, many of these conversions were unsuccessful or suffered from poor maintenance and a lack of programming or policing.1

Commercial shared streets differ from this earlier generation of pedestrian malls in both their regulation and implementation. Shared streets maintain access for vehicles operating at low speeds and are designed to permit easy loading and unloading for trucks at designated hours. they are designed to implicitly slow traffic speeds using pedestrian volumes, design, and other cues to slow or divert traffic.

The street illustrated below depicts a 22-foot shared way within a 30-foot right-of-way.


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Before
After

A commercial shared street environment should be considered in places where pedestrian activity is high and vehicle volumes are either low or discouraged.

Existing

The downtown street in the rendering above is a common sight in many older cities where downtown commercial streets may predate wider grid streets. In newer cities, a retail district with heavy parking utilization and narrow, congested sidewalks may have similar conditions or opportunities.
1 Sidewalk congestion creates unsafe conditions, as crowding forces some pedestrians to walk in the street to avoid crowds.
Vehicles in search of on-street parking create traffic congestion.
2 Loading and unloading trucks obstruct pedestrian and vehicle traffic. Truck drivers park on the sidewalk to preserve vehicle flow while unloading, forcing pedestrians to mix with motorists.

Recommendations

3 Textured or pervious pavements that are flush with the curb reinforce the pedestrian-priority operation of the street and delineate a non-linear path of travel or narrow carriageway. Special pavements, especially unit pavers, may be subject to additional maintenance costs and should be selected based on regional climate and long-term durability. Selection of snowplow-compatible materials is recommended for colder climates. Drainage channels should be provided either at the center of the street or along the flush curb, depending on existing conditions and the overall street width. Drainage channels are often used to define the traveled way from the clear path.2
4 Commercial shared streets should be accessible by single-unit trucks making deliveries. Where commercial alleys are non-existent, it may be advantageous to design a shared street to accommodate large trucks, though significant changes to the design should be avoided. Designated loading and unloading zones may be defined through differences in pavement pattern or use of striping and signage.
5 Street furniture, including bollards, benches, planters, street lights, sculptures, trees, and bicycle parking, may be sited to provide definition for a shared space, subtly delineating the traveled way from the pedestrian-exclusive area.
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Location: Cleveland, Credit: Michael Flynn
Shared streets may be closed to through traffic for specific portions of the day. Use movable planters and time-of-day restrictions to regulate the shared space.
Provide tactile warning strips at the entrance to all shared spaces. Warning strips should span the entire intersection crossing.
Prior to the application of a shared street, cities are encouraged to experiment with car-free hours or to test a conversion using temporary materials to evaluate the potential impact on traffic operations.

See Temporary Street Closures

Commercial shared streets restrict transit access. For pedestrian streets that provide direct transit access, consider the application of a transit mall.3
Depending on the overall street width, designers may consider providing a 3–5-foot-clear path protected from traffic. The clear path should be defined using planters, bollards, and street furniture, as well as detectable warning strips or textured pavers. For narrower shared streets and alleys, use of a clear path is discouraged.

Case Studies

Cambridge Shared Streets

Footnotes

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  1. The first pedestrian-only outdoor mall opened in Kalamazoo, MI, in 1959. For case studies of early pedestrian malls, see:

    Roberto Brambilla and Gianni Longo, For Pedestrians Only: Planning, Design, and Management of Traffic-free Zones, (New York: Whitney Library of Design, 1977).
  2. The San Francisco Better Streets Plan provides guidance on “channels” and “runnels” that may be suitable for center street drainage.

    Channels and Runnels,” San Francisco Better Streets: A Guide to Making Street Improvements in San Francisco, accessed May 21, 2013, http://www.sfbetterstreets.org/ find-project-types/greening-and-stormwater-management/stormwater-overview/channels-and-runnels/.

  3. “Transit Mall Case Studies,” (San Francisco County Transportation Authority).

References

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