Journal of Advanced Transportation / 2018 / Article / Tab 12

Research Article

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

Table 12

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

IntersectionNumber of tripsMeanSDMedian(Q1–Q3)CV%

Signalized15363.4248.0158.22(23.14–93.01)75.7
Roundabout13989.6756.2379.69(44.26–125.86)62.7

Total29275.9253.6265.47(34.13–109.97)70.6