Facts and Statistics

-*NERI - National Environmental Research Institute, Denmark

Because car-ventilation intakes are near the ground, the amount of micro-particles and NOx inside cars is up to 20% higher than street average which cyclists inhale. If cyclists choose streets with low amounts of car traffic, they can gain an additional 10-30% decrease in particle inhalation.

-“Four Types of Cyclists.” 2009 Survey by Roger Geller, Bicycle Coordinator, PBOT.

A 2009 poll in Portland found that 2/3 of the public either actively bikes or would consider biking if it was safe. Of these “bikers” only 10% regularly use existing infrastructure while 90% feel unsafe on the streets.

- Unpublished results from study by Dr. Jennifer Dill, Portland State University.

Research indicates that cyclists strongly prefer Neighborhood Greenways over bike lanes and that they will attract new and inexperienced cyclists. Ten percent of miles biked in a recent Portland study occurred on Greenways, which account for only 1% of the total bicycle infrastructure.

- Cited in Trails for Transportation, National Bicycle and Pedestrian Clearinghouse Technical Assistance Series, Number 3 (www.bikeped.org), 1995

A Harris poll found that 70% of U.S. adults want better facilities for non-motorized transport.

- Anne Vernez Moudon, et al., Effects of Site Design on Pedestrian Travel in Mixed Use, Medium Density Environments, Washington State Transportation Center (Seattle), 1996.

Walking is three times more common in a community with pedestrian friendly streets than in otherwise comparable communities that are less conducive to foot travel.

- Rudolph Limpert, Motor Vehicle Accident Reconstruction and Cause Analysis, Fourth Edition, Michie Company, Charlottesville, 1994, p. 66

The probability of pedestrians receiving fatal injuries when hit by a motor vehicle is 3.5% at 15 mph, 37% at 31 mph and 83% at 44 mph.

- James Mundell, “Neighborhood Traffic Calming: Seattle’s Traffic Circle Program,” Road Management& Engineering Journal. (www.usroads.com/journals/rmej/9801/rm980102.htm), January 1998.

A study of 119 residential traffic circles installed in Seattle between 1991 and 1994 found that reported accidents in those areas declined from 187 before installation to 11 after installation, and injuries declined from 153 to one.

- Stephen Burrington & Bennet Heart, City Routes, City Rights, Conservation Law Foundation (Boston; www.clf.org), 1998.

In a Dayton, Ohio case study, traffic calming reduced neighborhood crime by 25-50% and encouraged residents to get to know their neighbors better and become more involved in community activities.

- Gordon Bagby, “Effects of Traffic Flow on Residential Property Values,” Journal of the American Planning Association, Vol. 46, No. 1, January 1980, pp. 88-94.

A study in Grand Rapids , Michigan found that traffic restraints that reduced traffic volumes on residential streets by several hundred vehicles per day increased house values by an average of 18%.

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