View
217
Download
0
Category
Preview:
Citation preview
40 km/h Speed Limit : Experiences & Lessons Learnt Tazul Islam, Ph.D.
City of Edmonton Office of Traffic Safety
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Outline
Program Background
Community Selection
Program Details
Data Collection
Evaluation Methods
Results
Conclusions
Q & A
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Background Local and international factors to lend support for a speed limit reduction
Speeding/careless driving is the top community problem
City Councilors were receiving ongoing and sustained speeding complaints
Need for a broader systemic solution
Evidence of speed-collision relationship
Discussion in the 1st conference in 2009
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Background
City Council’s Transportation Committee asked to review the potential of
reducing speed limits on residential roads
The OTS was identified as the lead agency for this initiative
Stakeholders workshop in June 2009
Edmonton Federation of Community Leagues (EFCL)
Edmonton Public School Board
Edmonton Catholic School Board
Alberta Motor Association
Edmonton Police Service (EPS)
The EFCL also conducted an online speed reduction survey
Recommendation to reduce the limit to 40 km/h or less on residential roads
On October 6, 2009, City Council approved the pilot project
investigate the effect of lowering the posted speed limit to 40 km/h
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Neighborhood Selection The selection process started in Oct 2009 and ended in Feb 2010
New 40 km/h sign installed in April 2010 and kept covered until the bylaws
came into effect on May 1, 2010
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Neighborhood Selection
Old (1950’s/1960’s) Communities
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Neighborhood Selection
Grid-based Communities
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Neighborhood Selection
New (1970’s/1980’s) Communities
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Program Details Pre-and post-communication plan to keep stakeholders informed
Media campaign (local TV, print, radio, online)
A variety of educational and enforcement measures
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Data Collection Speed and traffic survey data
24/7 data collection for treated, control and adjacent communities
A total of 73 locations
Before (April); After (May to October)
25 million individual vehicle data records
Collision data
Motor Vehicle Collision Information System (MVCIS)
3-year before and 3-year after data
Community perceptions
Random telephone survey
Prior to project initiation (Mar) and the end of the project (Nov)
A total of 300 residents in the pilot communities
Others
Road geometry
Neighborhood characteristics
Census data
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Evaluation Methods
Before-after evaluation methodology was adopted
Speed and traffic volume
Before-after evaluation with control group
Collision
Bayesian before-after evaluation
Public perception
Simple before-after evaluation
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Speed & Traffic Evaluation Results
≈4 km/h reduction in
mean and 85
percentile speed
≈ 4% reduction in
traffic volume
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Speed & Traffic Evaluation Results
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Collision Evaluation Results
13
24
12
0
5
10
15
20
25
30
Total Severe PDO
% C
olli
sio
n R
ed
uct
ion
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Perception Evaluation Results
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Follow-up Survey Telephone interviews between July and August, 2011
2,044 interviews were completed
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Conclusions
• Posted speed limit reduction was successful in terms: – Speed
– Traffic volume
– Crash
– Perception
• New Speed Reduction Policy – 67% community support
• Recent discussions
8th International Conference on Urban Traffic Safety
April 25-28, 2016 | EDMONTON, ALBERTA, CANADA
Thank You! tazul.islam@edmonton.ca
Recommended