Journal of Advanced Transportation / 2018 / Article / Tab 11

Research Article

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

Table 11

Logistic regression relating risk of “high” CO emissions to intersection type and test car driver.

Number of trips with CO ≥ 129 mgNumber of total tripsCoefficientOdds ratio95% CIp value

Intersection:
Roundabout 381391
Signalized 701530.6621.94(1.16, 3.24)0.0114
Driver:
D2191081
D1891841.3984.05(2.27, 7.23)<0.0001

(Likelihood ratio: χ2 = 35.92, DF = 2, value < 0.0001).