bike to work day: increasing cycling and reducing...
TRANSCRIPT
Bike to Work Day: Increasing Cycling and Reducing Driving
Krista Nordback, P.E., Ph.D. Oregon Transportation Research and Education Consortium (OTREC) Portland State University 503-725-2897 [email protected]
Bicycle Urbanism Symposium Friday, June 21
Overview
• Introduction • Data & Methods • Results • Conclusions
Photo: http://biketowork2013.org/ Denver Regional Council of Governments Accessed June 7, 2013
Community Cycles, Accessed 6/7/13 https://www.facebook.com/Walk.Bike.Month/photos_albums
More Cyclists!
Fewer Cars?
Data
BICYCLE DATA
Automated Continuous Bicycle Counters
25 stations
• 3 on-street since 2010
• 22 on paths since 1999
BOULDER COLORADO
Inductive loop counters on-street
Inductive loop counters on-street
0
50
100
150
200
250
300
350
400
450
2-Jun 12-Jun 22-Jun 2-Jul 12-Jul 22-Jul 1-Aug 11-Aug
Daily
Bic
ycle
Cou
nt June and July 2008
Bike to Work Day June 25, 2008
0200400600800
1,0001,2001,4001,600
Aver
age
Daily
Bic
yclis
ts
Bicycle Count Station
2005
Bike to Work DayWednesday
Bike To Work Day Doubles Counts
0
200
400
600
800
1000
1200
1400
1600
2005 2007 2008 2009 2010 2011
Daily
Bic
ycle
Cou
nt
Year
Bike to Work Day
Average Wednesday inJune and July
MOTOR VEHICLE DATA
Motor Vehicle Counters
Metro Count Accessed 6/13/13 http://mtehelp.tech-metrocount.com/article.aspx?key=mc5805
Inductive Loops
Photo Red-light Camera
Motor Vehicle
Counters
Motor Vehicle Count Stations
• 5 Stations • 5 Years
Number of Stations By Year
2005 2 2007 2 2008 5 2009 4 2010 3
Total Cases 16
Motor Vehicle Counts (June and July)
26,612 26,839
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
Aver
age
Daily
Traf
fic
Bike to Work DayAverage Wednesday
Reality Check
• 500 additional bike counts on Bike to Work Day • Average about 27,000 motorists/day on typical
summer Wednesdays
500/27,000 = 2% drop in counts
Can we find a 2% change in motor traffic volumes?
Methods • Test each of the 16 cases as pairs:
– Bike to Work Day count – Average of all other Wednesdays in June and July
• Paired Student T-Test: Is there evidence of lower motor
traffic on Bike to Work Day than on the average summer Wednesday?
Results
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7N
umbe
r of I
nsta
nces
Difference in motor traffic between average Wednesdays in June and July and Bike to Work Day
Difference between Wednesdays and Bike to Work Day
Station 2005 2007 2008 2009 2010 Southbound 28th Street at Canyon Blvd. -0.42% -2.06% -1.20% Northbound 28th Street at Canyon Blvd. -2.64% -1.71% -2.74% Southbound 28th Street at Arapahoe -0.05% -1.77% -0.16% Westbound US 36 at McCaslin in Superior -1.38% 0.80% -2.07% -1.29% Eastbound US 36 at McCaslin in Superior -0.27% 1.59% -1.58%
Significant decrease on Bike to Work Day at 80% confidence level
Results of Paired T-test
For the 16 test pairs (one-tailed test): – P-value: 0.016 – There is evidence at the 95% confidence level that
Bike to Work Day motorized traffic is lower.
Evidence of Reduced Traffic on Bike to Work Day
• 5 of the 16 cases show a significant drop in motor traffic at the 80% confidence level.
• 14 of the 16 cases show a decrease in traffic. • 1% drop in traffic on average across all 16
cases. • Paired t-test: Bike to Work Day is lower than
Wednesdays with 95% confidence.
Conclusions
Conclusions • About twice as many cyclists on Bike to Work
Day in Boulder • There is evidence of lower motor traffic
volumes on Bike to Work Day in Boulder.
Questions?
Photo: http://biketowork2013.org/ Denver Regional Council of Governments Accessed June 7, 2013
Krista Nordback, P.E., Ph.D. Oregon Transportation Research and Education Consortium (OTREC) Portland State University 503-725-2897 [email protected]
Limitations
• Boulder specific. • Photo red-light camera counts have not been
validated. • Two of the motor vehicle locations are outside
of the city.
