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Traffic Calming in Canadian Urban Areas
Table of Contents
Additional Information
Summary
Overview
Over the last 10 to 15 years, traffic calming has become an accepted form of
traffic management in Canadian communities. The 1998 publication of the Canadian
Guide to Neighbourhood Traffic Calming was a major validating step.
Traffic calming is often advocated by community groups that are concerned with
a range of issues related to excessive traffic speeds and volumes, and poor driver
behaviour. It is sometimes perceived as a process rather than just a physical change,
and extensive community participation in traffic calming projects is typical.
Dozens of Canadian municipalities now have significant traffic calming experience,
and many of these have developed policies or guidelines to help ensure consistency,
equity and effectiveness in their traffic calming endeavours.
Major traffic calming issues that have been explored through the experience of
various Canadian communities include: impacts on road safety, emergency vehicles,
cyclists, transit service and maintenance practices; preservation of neighbourhood
equity; questions of applicability to major streets and new neighbourhoods; methods
of achieving public consensus and approval; balancing costs and financing opportunities;
managing liability; environmental approvals; and the use of temporary installations.
Resources
- Canadian Institute of Transportation Engineers and Transportation Association
of Canada, Canadian Guide to Neighbourhood Traffic Calming, 1998 (available
from www.tac-atc.ca)
- Institute of Transportation Engineers and United States Federal Highway
Administration, Traffic Calming: State of the Practice, 1999 (available online
at www.ite.org/traffic/tcstate.htm)
- ITE Traffic calming library (available online at
www.ite.org/traffic
Related case studies in this series
- Case Study #30 – St George Street Revitalization: “Road Diets” in Toronto
TP 14415 E
Definition and purpose of traffic calming
The practice of traffic calming is now four decades old, and has spread around
the world from its roots in northern Europe. Although the definition and physical
forms of traffic calming change from place to place, it is generally understood
to involve the mitigation of traffic’s undesirable effects within communities. In
Canada, the most accepted definition of traffic calming has been proposed by the
Canadian Institute of Transportation Engineers (CITE) and the Transportation Association
of Canada (TAC) in the Canadian Guide to Neighbourhood Traffic Calming:
- Traffic calming is the combination of mainly physical measures that reduce
the negative effects of motor vehicle use, alter driver behaviour and improve
conditions for non-motorized street users.
The overriding purpose of traffic calming is to restore streets to their intended
function by reducing speeds, discouraging excessive through traffic, and minimizing
conflicts among road users. Traffic calming is often advocated by community groups
that are concerned with a range of traffic-related issues:
- Safety threats due to speeding and aggressive driving
- Traffic noise, emissions and vibrations
- Low rates of walking, cycling and transit use
- Poor social cohesion due to a street environment that discourages neighbours
from engaging each other
- Aesthetic problems including excessive pavement, lack of greenspace, and
poor property maintenance
Traffic calming measures typically include vertical and horizontal deflections
in the road surface, as well as road obstructions and traffic regulations. The roots
of traffic calming lie in woonerven created by Dutch communities beginning
in the 1960s — they eliminated the curbs that separated roads from sidewalks and
play areas, and thus integrated roadways with adjacent outdoor spaces. This approach
remains the ultimate form of traffic calming, and is only appropriate in limited
circumstances. In contrast, traffic calmed roads in most western countries clearly
remain vehicular zones, but ones that are respectful of other activities in or near
the right-of-way like cycling, walking, playing and socializing.
To some people, the phrase “traffic calming” implies more than physical changes
— it represents a process of social change requiring extensive community participation.
Traffic calming projects often involve area residents directly in collecting information,
identifying problems, developing alternative solutions, and making recommendations.
Where the problematic drivers include neighbourhood residents, outreach and communications
activities like street sign or bumper sticker campaigns, block parties, newsletters
and discussion groups can help to foster attitudinal change and a broader public
awareness of behavioural problems and solutions.
Canadian Guide to Neighbourhood Traffic Calming
In 1998, the Canadian Institute of Transportation Engineers joined with the Transportation
Association of Canada to publish the Canadian Guide to Neighbourhood Traffic
Calming. The guide’s purpose is to help practitioners understand traffic calming
principles and applications and achieve some level of standardization, while minimizing
liability and maximizing public safety.
The guide focuses on traffic calming measures for local and collector streets
in established residential areas. It mainly addresses retrofit situations (i.e.
traffic calming on existing streets, rather than streets in new developments), and
takes a flexible approach that recognizes the need for traffic calming to reflect
local conditions. The guide documents the effectiveness and recommended applicability
of a wide range of traffic calming measures, and proposes a step-by-step process
for involving affected communities in the development of traffic calming plans.
![Canadian Guide to Neighbourhood Traffic Calming](/web/20071225055018im_/http://www.tc.gc.ca/programs/environment/UTSP/images/image.JPG)
Based on the Canadian guide and on American experiences with traffic calming,
the Institute of Transportation Engineers and the United States Federal Highway
Administration published Traffic Calming: State of the Practice in 1999.
That document offers a synthesis of North American traffic calming experience in
residential neighbourhoods and rural communities subjected to entering highway traffic.
The Canadian and American documents are available from
www.tac-atc.ca and
www.ite.org/traffic/tcstate.htm,
respectively.
Summary of Canadian experiences
Since the 1970s, cities like Toronto, Vancouver and Ottawa have tested innovative
solutions to traffic-related neighbourhood problems. Their downtown residential
areas have long suffered from cut-through traffic, as commuters take advantage of
local street grids to escape congestion on parallel arterial roads. Early approaches
to traffic calming often included attempts to deter non‑resident drivers from entering
neighbourhoods by closing access points and creating maze-like street patterns through
turning prohibitions and one-way designations.
However, in the last 10 to 15 years Canadian municipalities of all sizes have
experienced a substantial growth in traffic-related complaints from residents in
recent suburban developments as well as inner cities. Conventional suburban streets
tend to have wide paved surfaces, gentle curves, little on-street parking activity,
and long block lengths — a combination that virtually invites drivers to travel
at speeds well above posted limits.
In the face of these public concerns and supported by a growing body of international
literature, traffic engineering professionals in cities across Canada have tested
and evaluated different traffic calming measures. Not only does a northern climate
present some unique constraints on road modifications, but every community has its
own culture that helps to define the “art of the possible.” Traffic management can
also be a highly charged and controversial topic — typically, both “winners” and
“losers” want to express opinions about potential changes. For these reasons, and
due to a lack of national guidance on technical issues, progress was relatively
slow until the Canadian Guide to Neighbourhood Traffic Calming was published
in 1998 and improved traffic calming’s standing as an accepted traffic management
tool. Since that time, dozens of Canadian cities have moved forward proactively
in applying traffic calming solutions.
Figure 1 shows a selection of 30 Canadian municipalities that have significant
traffic calming experience. For each community, the figure identifies whether local
traffic calming applications have been planned and implemented with a focus on individual
streets or entire neighbourhoods, and whether the community has developed a detailed
policy or guidelines as a framework for traffic calming measures.
Many municipalities have found fixed policies or guidelines to be helpful in
prioritizing numerous public requests for help, conducting studies that are thorough
and equitable, and consistently implementing measures to achieve predictable results.
Some municipal traffic calming policies also address other issues such as cost-sharing
between local government and benefiting residents, limits on traffic calming to
respect the needs of emergency and transit vehicles, and approaches to gaining neighbourhood
consensus and approval.
Figure 1: Canadian municipalities with significant traffic calming experience
Municipality |
Detailed policy or guidelines |
Project focus |
Street |
Area |
British Colombia |
City of Burnaby |
|
|
yes |
City of Coquitlam |
yes |
|
yes |
Corporation of Delta |
yes |
|
yes |
City of Kelowna |
yes* |
|
yes |
City of Langley |
yes |
|
yes |
City of North Vancouver |
yes |
|
yes |
City of Port Moody |
yes |
yes |
|
District of Saanich |
yes |
|
yes |
City of Surrey |
yes |
|
yes |
City of Vancouver |
yes |
|
yes |
City of Victoria |
|
|
yes |
District of West Vancouver |
yes |
yes |
|
Alberta |
City of Calgary |
yes |
|
yes |
City of Edmonton |
|
|
yes |
Saskatchewan |
City of Saskatoon |
|
|
yes |
Manitoba |
City of Winnipeg |
yes+ |
yes |
|
Ontario |
City of Toronto |
yes |
yes |
|
City of Ottawa |
yes* |
|
yes |
City of Waterloo |
yes |
yes |
|
City of Oakville |
yes |
|
|
City of Markham |
yes* |
|
yes |
City of Pickering |
yes |
|
yes |
City of Vaughan |
yes |
|
yes |
City of Windsor |
yes |
|
yes |
Quebec |
City of Gatineau |
yes |
|
yes |
City of Montréal |
|
|
yes |
City of Sherbrooke |
|
yes |
|
City of Quebec |
|
|
yes |
New Brunswick |
City of Fredericton |
yes |
|
yes |
Nova Scotia |
Municipalité régionale d’Halifax |
yes* |
|
yes |
* Component of broader policies or guidelines for traffic management
or road safety
+ Limited to the use of speed humps
Major issues
The following paragraphs touch on some of the major issues that have been explored
through traffic calming experiences in communities across Canada.
Road safety impacts
Traffic calming measures can have significant road safety benefits. The
Insurance Corporation of British Columbia (which has funded traffic calming projects
to reduce insurance claims) commissioned a study in the mid-1990s to examine the
impact of different traffic calming schemes in four Greater Vancouver neighbourhoods.
The study found that annual collision frequencies and insurance claims both decreased
by about 40%. Combining this research with information from Europe led to the finding
that measures like speed humps, road narrowings, chicanes (lateral “zigzag” deflections)
and traffic circles can all reduce site-specific collisions by 75% to more than
80% (Source: S. Zein et al., “Safety Benefits of Traffic Calming” in Transportation
Research Record 1578, Transportation Research Board, 1997).
Applicability to different types of streets
Traffic calming measures typically are found on minor streets within residential
neighbourhoods. Some municipalities have used them on busier collector roads, and
a few have even experimented with arterial streets. Such attempts generally have
mixed results, and lead to significant public reaction. In Ottawa, speed humps on
a busy multi-lane one-way street through a downtown neighbourhood have been the
subject of great public debate, but have also substantially reduced the number of
traffic collisions along the road. However, road narrowings along pedestrian-heavy
commercial streets that only intrude into reserved parking lanes are quite common
and generally work well.
Impacts on transit and emergency vehicles
Most communities do not permit vertical traffic calming measures like speed
humps or raised crosswalks on streets that serve transit routes or are used frequently
by emergency vehicles. Each such measure can delay fire trucks, ambulances and buses
by up to 10 seconds, with a group of measures threatening an unacceptable cumulative
delay. However, on local streets within neighbourhoods the acknowledged benefits
of traffic calming usually outweigh the possible impacts on emergency response.
Neighbourhood equity
Fairness is always a significant issue in traffic calming schemes. Measures
that slow traffic on one street can simply displace vehicles onto adjacent streets.
And measures that prohibit short-cutting drivers from entering a neighbourhood also
make it more difficult for neighbourhood residents to reach their homes, or for
visitors to reach local businesses and institutions.
Walking and cycling
While pedestrians take a generally favourable view of traffic calming,
cyclists have a more mixed perspective. Vertical measures like speed humps are well
accepted, but horizontal measures can cause problems for cyclists unless they are
carefully designed. Cyclists can be put at risk by road narrowings or lateral diversions
that require them to change their travel path relative to the path of adjacent motor
vehicles. For example, lanes shared by bikes and cars should have a constant width
as they pass through narrowings or chicanes.
Community consensus
Given that most traffic calming schemes generate mixed reaction within
affected communities, municipalities face the difficult task of saying how much
support is needed to warrant moving ahead. In some cases, city staff will let elected
officials weigh opposing arguments and make a judgement call — but in others, supportive
signatures of 70% or more of area residents must be collected before a plan or measure
can be approved.
Costs
Traffic calming measures range from relatively affordable to very expensive.
Retrofit designs that affect drainage patterns, utility pole locations or underground
services can be very costly, and add up to more than $100,000 for a minor intersection.
Simple and effective speed humps, however, generally cost only a few thousand dollars
each.
Funding
To preserve equity and avoid giving effective priority to wealthier neighbourhoods,
many municipalities prohibit residents from paying directly for traffic calming
measures. Others welcome this approach, however — Coquitlam, B.C. uses general revenues
to fund just 10% of a traffic calming measure’s costs, while the remaining 90% comes
from a levy on the benefiting residents.
Liability
Early in the development of North American traffic calming practice, liability
was a major concern of municipal engineers who had little solid evidence with which
to establish confidence in traffic calming’s safety impacts. However, repeated investigations
have found very few problematic legal issues arising from traffic calming measures.
One major U.S. study reviewed records from 50 cities and counties with traffic calming
programs, and found just one successful lawsuit related to traffic calming (Source:
R. Ewing, “Traffic Calming Liability Issues,” 2000 Annual Meeting Compendium,
Institute of Transportation Engineers). The growing use of traffic calming policies
and guidelines springs partly from their usefulness as tools to minimize liability.
Maintenance impacts
As with liability, the impacts of traffic calming on snow clearing, road
sweeping and other maintenance practices are no longer a widespread concern. Some
early traffic calming measures did cause undue delays to snowplows and other maintenance
vehicles, but design modifications have minimized such issues. Nevertheless, traffic
calming measures can have tangible impacts on maintenance needs and costs — and
when some municipalities now approve traffic calming measures they account for not
only capital costs but also future incremental costs for snow clearing and other
maintenance.
Applicability to old and new neighbourhoods
Traffic calming experiences have led some municipalities to change the
way that new neighbourhoods are designed, in order to minimize the need to retrofit
them with traffic calming measures in the future. Some communities even build traffic
calming measures into new streets when an eventual need is anticipated.
Environmental approvals
In Ontario, regulations have been enacted that require an Environmental
Assessment process to be followed before traffic calming measures can be installed
or removed. While this requirement has not significantly changed the way that large
traffic calming studies are conducted, it has made it much more difficult and costly
to implement traffic calming as a “spot” solution.
Temporary installations
Some communities encourage or require the use of temporary traffic calming
installations (i.e. before taking permanent steps) to measure the effecOne challenge
will be to extend the objectives of traffic calming to arterial roads, where safety
concerns have led to the emergence of “speed management” as an important engineering
research topic. One offshoot of the traffic calming movement that has already spread
to major streets is the use of roundabouts to replace signalized intersections on
collector and arterial roads. Their ability to reduce delay and emissions and improve
safety has been demonstrated in cities across the continent.