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Country Lanes: Greening Local Transportation
Community context
With an older grid street system, the majority of Vancouver’s residential
neighbourhoods include rear lanes and alleys that form an important component of
the city’s local transportation network. } Policy context
Upgrades to lanes and streets in Vancouver are generally achieved through the
Local Improvement Process, which enables the City and property owners to share
the cost of an improvement project. Before a Local Improvement is approved by
Council, there must be support from the local residents. Resident-initiated
projects require 67% local support to proceed, while City-initiated projects
require 50% objections to be defeated. Rationale and objectives
The Country Lanes Demonstration Project originated from community desire for the
City to provide a more environmentally friendly and visually attractive
alternative to Vancouver’s existing asphalt lanes. The initiative was further
propelled by a policy directive from the City’s Corporate Management Team which
encouraged staff to “incorporate enhanced sustainability into all the City
Operations as a way of doing business.”
ActionsRegular
community input from City residents determined that many Vancouver
neighbourhoods wanted lanes to be less sterile, use less asphalt and to be more
environmentally friendly. When it was suggested that residents wanted their
lanes to be more rural and less urban, the idea of a “country” lane versus a
“city” lane was developed.
Driving strips. The driving strips are required to provide the structural strength for vehicles using the lane. Several materials were considered for the driving strips including concrete, asphalt, gravel and structural grass. Ultimately gravel was selected as the most cost effective and durable material.
Structural grass. Structural grass is required to provide some additional structural strength in locations where vehicles turn off the driving strips. Two products were selected for testing, Golpla and Geoblock. It should also be noted that since the project began, additional products have emerged that may be worth investigating.
Lane entrances and driveway connections. In addition to the driving strips, the lane entrances and driveway connections were given special consideration. At lane entrances, the turning of heavy multi-axle vehicles places a large stress on the lane surface. At these locations, concrete aprons and permeable pavers were extended into the lane to provide a more durable surface for these movements. Permeable pavers, gravel and broken concrete (salvaged from City operations) were installed and evaluated at different driveway and garage connections.
Subgrade
material and preparation. The base material for the Country Lanes design was
particularly challenging as it had to allow for good drainage, provide strong
structural integrity for heavy vehicular traffic, provide sufficient nutrients
and retain enough moisture to promote healthy grass growth throughout the year.
The City decided to develop an engineered soil to meet the above requirements.
This soil is a mixture of ¾” aggregate that interlocks to provide structural
strength, and a sand/soil mixture filling the voids to provide a growth medium
for healthy grass root development and allow for drainage. . Construction methodology
Results The
Country Lane Demonstration Project has also been recognized throughout the Lower
Mainland, Canada and internationally with requests for design data from many
cities and municipalities. Participants
The Country Lanes Demonstration project closely involved community members at
the pilot sites. Residents were able to customize features, help with plantings
and get involved with lane maintenance. One of the lanes was developed next to
an urban agriculture demonstration garden operated by a local environmental
organization called City Farmer whose members were actively involved in their
lane’s construction and maintenance.
ResourcesThe Country Lanes Demonstration Project cost approximately twice as much as paving a full width. Elevated costs are due to:
It is estimated that as crews become accustomed to the new construction methods and the design is refined, Country Lanes will cost between 25-100% more than asphalt. It is estimated that a lane with extruded concrete driving strips will cost between 50-100% more than full width asphalt. A Country Lane with structural gravel driving strips is estimated to cost 25-50% more than full width asphalt. Country Lanes will always cost a premium over asphalt lanes, as Country Lanes have more construction steps than asphalt lanes, and there is considerably more detailed or hand work.
Lessons learnedAs a demonstration project involving three different types of lanes, the Country Lanes Project helped resolve several design, maintenance and planning concerns before being implemented city-wide. Design and construction. A number of design and construction approaches will be incorporated in future Country Lane projects. Although too numerous to mention here, some of the key recommendations include:
Drainage. Preliminary results show that the lanes are highly permeable and there are no associated runoff problems. However, it is difficult to direct any overland flow when using a structural grass material. Unlike asphalt lanes, structural grass does not easily allow for a lip to be constructed to channel flow. Care needs to be taken during construction to ensure that the grade of the lane does not direct flow into driveways. Community involvement. Although community feedback was generally positive, some residents were disappointed by the lack of input they had in their lane design. It is important that residents are both involved in the design process and understand the cost limitations associated with “customizing” the lane. Maintenance. The ongoing maintenance associated with Country Lanes has yet to be determined. As Country Lanes have the potential for frequent and time consuming maintenance, monitoring over the next 5 to 10 years is important to assess their long term requirements. Possible maintenance issues include:
To date, the City has assumed highly repetitive maintenance such as mowing while watering and weeding will be done by lane residents. Inadequate maintenance may alter the permeability of the lane and create major drainage issues. Utilities maintenance and construction access. Lanes are frequently used for utility services which need to be repaired or replaced. Repairing a Country Lane after a utility cut is likely to be a very difficult and costly task which could require the reconstruction of the entire lane. This raises the question about the appropriateness of using a structural grass product which may not be easily repaired and replaced. Similarly, lanes are often used for construction vehicles. In many cases the only access available for construction vehicles may be to use the Country Lane. These properties need to be identified and flagged at the building permit stage. In addition, a larger damage deposit would be required from the builder. The City currently requires an $800 deposit for lane damage. This amount would need to be significantly increased to cover any damage caused to the Country Lane and to deter contractors from using the lane if other access options are available. Next steps
Although the project has been a success, several key design and implementation
issues have yet to be resolved before Country Lanes can be confidently
implemented throughout the city. Most notably perhaps is the need to determine
how Country Lanes can be equitably and efficiently accommodated by the Local
Improvement process. |
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