Journal of Advanced Transportation / 2018 / Article / Tab 8

Research Article

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

Table 8

Descriptive statistics for CO2 emissions (g) by intersection type (traffic condition = peak).

IntersectionNumber of tripsMeanSDMedian(Q1–Q3)CV%

Signalized15360.6319.4460.43(45.42–78.21)32.1
Roundabout13954.4920.7248.14(39.75–63.79)38.0

Total29257.7020.2653.98(41.18–72.12)35.1