During the last decade many traffic signal controlled intersections have been replaced by
roundabouts. There has been a trend towards the establishment of roundabouts where …

This research examined the operations of a four-legged, two-lane modern roundabout with
different combinations of approach volumes. Because of the insufficient number of …

Reduced emissions and improved air quality are typically attributed to the use of
roundabouts rather than traditional stop or signal control. Roundabouts are expected to …

Modern roundabouts are more and more widely used at both urban and rural intersections
in North America. The results of traffic operations analysis at roundabouts often depend on …

In Italy, almost half of all road crashes occur at intersections, primarily in urban areas. In
recent years the widespread conversion of at-grade intersections to roundabouts has …

The majority of the existing speed and crash models in use today were developed based
upon data from modern roundabouts located outside the United States. These models …

This study aims to use operational characteristics to help determine the size and the design
of intersections on the basis of a targeted level of operation. This approach will allow for a …

Background The proliferation of portable electronic devices among consumers has created
in recent times new opportunities for traffic data collection. Many of these devices contain …

This study examines the effect of heavy vehicles (trucks) on entry capacity of roundabouts.
The movements of vehicles were observed at 11 roundabouts in Vermont, Ontario and …

Existing studies on modern roundabouts performance in the US are mostly based on data
from singe lane roundabouts that are not heavily congested. The main objective of this study …