A comparative analysis of the performance of turbo roundabouts based on geometric characteristics and traffic scenarios

ABSTRACT

This study aimed to investigate the effect of geometric characteristics and traffic scenarios on the performance measures, including delay, volume to capacity (v/c) ratio, capacity, and the level of service (LOS) in basic and rotor turbo roundabouts. In addition, it attempted to compare turbo roundabouts using performance measures based on geometric characteristics and traffic scenarios. The results showed that performance measures reduced significantly by increasing the diameter of four-leg turbo roundabouts although they improved in three-leg turbo roundabouts. Further, four- and three-leg basic turbo roundabouts had a better performance by changing the balanced to imbalanced traffic flow scenario compared with four- and three-leg rotor turbo roundabouts. Additionally, substituting four- and three-leg basic turbo roundabouts for rotor four- and three-leg turbo roundabouts increased the performance measures. Overall, the basic turbo roundabouts had a better performance compared to the rotor turbo roundabout under unsaturated and saturated traffic conditions .

KEYWORDS:

• Basic turbo roundabout
• rotor turbo roundabout
• performance measures
• delay
• capacity
• level of service

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors declare that there was no funding to support this study.