Journal of Advanced Transportation / 2018 / Article / Tab 10

Research Article

Before-and-After Field Investigation of the Effects on Pollutant Emissions of Replacing a Signal-Controlled Road Intersection with a Roundabout

Table 10

Descriptive statistics for CO emissions (mg) by intersection type (traffic condition = peak).

IntersectionNumber of tripsMeanSDMedian(Q1–Q3)CV%

Signalized153153.10140.10106.30(46.80–208.00)91.5
Roundabout139101.8985.4681.09(39.24–137.86)83.9

Total292128.70119.8692.18(42.06–174.65)93.1