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Conducting environmental assessments for physical activity: determining traffic volume in walkability audits in two
Karen K Lee1, Candace D Rutt, Andrea Sharma
1Centers for Disease Control and Prevention, Atlanta, GA 30341, USA.
Background:
In this article, we examine the possibility of reducing time to conduct traffic volume audits through (1) reducing time for manual traffic counting and (2) using Department of Transportation (DOT) information.
Methods:
In audits of 824 road segments in 2 West Virginia (WV) communities, manual traffic counts were recorded for 1, 2, and 5 min in duration. Annual Average Daily Traffic (AADT) was calculated from counts. Available AADT from DOT was also collected. Percent agreement and a weighted kappa were calculated between 5-min count and 1- and 2-min count AADT categories and between 5-min count and DOT AADT categories.
Results:
One- and 2-min counts produced identical AADT categories as 5-min counts in 93.4% and 95.0% of segments, respectively. Weighted kappa was 0.79 (95% CI = 0.74-0.85) and 0.85 (95% CI = 0.80-0.89), respectively. Forty-two segments (5.1%) had DOT data.
Conclusions:
DOT AADT was available for a small percentage of road segments assessed. The high agreement between AADT categories produced by 1- and 2-min counts and 5-min counts makes it reasonable to consider using 1- or 2-min manual traffic counts if time or staffing constraints make it necessary. Possible generalizability of this methodology to other communities, particularly larger urban and suburban areas, will require further research.
