Conducting environmental assessments for physical activity: determining traffic volume in walkability audits in two West Virginia communities.
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.
Lee
Karen K
KK
Centers for Disease Control and Prevention, Atlanta, GA 30341, USA.
Rutt
Candace D
CD
Sharma
Andrea
A
Pratt
Michael
M
Flesch
Judd
J
Maynard
L Michele
LM
Kennedy
Keri
K
Adams
Peggy
P
Kohl
Harold W
HW
D003625:Data Collection / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D009043:Motor Activity; D012111:Residence Characteristics; D012424:Rural Population; D013219:State Government; D013997:Time Factors; D014186:Transportation / Q000706:statistics & numerical data*; D014505:Urban Population; D016138:Walking; D014903:West Virginia