Journal of Advanced Transportation / 2018 / Article / Tab 3

Research Article

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

Table 3

Roundabout characteristics [4].

General characteristicsApproach characteristics
Approach
NorthEastSouthWest

Inscribed circle diameter [m]36Entering lanes [#]2121
Central island diameter [m]20Exiting lanes [#]1111
Circulatory roadway width [m]8Splitter island width [m]4.503.804.204.20
Lanes in circulatory roadway [#]1Entry width [m]7.254.507.253.75