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Designing Road Diet Evaluations: Lessons Learned from San Jose’s Lincoln Avenue Road Diet
This report analyzes traffic impacts from the 2015 implementation of a pilot “road diet” on Lincoln Avenue, in the City of San Jose, California, comparing data on traffic volumes and speeds from before and after the road diet was implemented. The analysis looks at impacts on both the road diet location itself and on surrounding streets likely to have been impacted by traffic diverted off the road diet segment. The results within the road diet zone were as expected, with falling volumes and numbers of speeders. The all-day data aggregated by street type (e.g., neighborhood streets, major streets) showed limited overall negative impacts outside the road diet segment. These summary results do not tell the entire story, however. Individual locations, particularly among the neighborhood streets, saw more noticeable negative impacts. The report ends with recommendations for best practices in designing and conducting road diet evaluation studies.
The road diet did not divert traffic to other streets in the neighborhood.
Traffic volumes fell noticeably more during the peak hours than it did for all-day counts.
The road diet successfully reduced the number of speeders along the road diet segment, but surrounding streets saw the number of speeders increase.
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