Conference Interactive Program
To view the 2013 Annual Meeting Interactive Program
TRB 91st Annual Meeting (January 22-26, 2012)
Planning for Pedestrians
Jan 24 2012 7:30PM- 9:30PM
Marriott, Salon 2
Associations Between Road Network Connectivity and Pedestrian-Bicyclist Accidents (12-0478)
It has been extensively accepted that the road network connectivity can positively impact the propensity and duration of non-motorized travel. But its impact on non-motorist traffic safety is still under debate: on one side, well-connected road network could lead more through traffic into the core area of a region so that pedestrians and bicyclists would be more frequently exposed to conflicts with cars; on the other side, it could be safer when vehicle speed is slowed down by dense intersections and drivers are forced to concentrate on surroundings by active walking and bicycling. This debate stimulates the paper to estimate the associations between road network connectivity and pedestrian-bicyclist crashes. Four commonly utilized connectivity measures including block density, intersection density, street density, and mean block length are calculated based on the road networks of 321 census tracts in Alameda County, California. Then the four measures together with other factors like traffic behavior, land use, transportation facility, and demographic feature are employed separately in a spatial statistical model called geographically weighted regression. Conclusions are: first, the decrease of pedestrian-bicyclist accident is significantly related to higher block density, higher intersection density, higher street density, and shorter mean block length; second, compared with other three connectivity measures, street density is better for modeling because of its higher stability and stronger explanatory ability; third, employing street network, traffic behavior, and transportation facility data into the same model can produce the best model fitness.
Zhang, Yuanyuan , University of California, Berkeley
Bigham, John M., University of California, Berkeley
Li, Zhibin , Southeast University, China
Ragland, David R., University of California, Berkeley
Chen, Xiaohong , Tongji University, China
Transportation Research Board. 500 Fifth St. NW, Washington, D.C. 20001
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