Abstract
Roundabouts are one of the safest types of intersections. There are a number of roundabout types in literature. Each roundabout type is distinguished by some characteristics. To design more efficient junctions, hybrid roundabouts can be created by combining their required characteristics geometrically. In this study, the safety feature of the turbo junction type and the easing up the traffic density feature of the hamburger junction have been combined. Some geometric parameters and layout details of the proposed hybrid roundabout are given, and its performance was simulated in a signalised 4-leg roundabout as the most frequently used intersection in Antalya. The performance of the proposed hybrid roundabout was compared with the status in 2016 and the current status in 2017 and beyond of the roundabout through AIMSUN transport simulation software. In regard to performance analysis, delay time, travel time, speed, density, fuel consumption, number of stops, queuing, carbon emission were analysed for all statuses and compared. In addition, traffic safety analysis has been performed for all statuses and compared. Results show that the overall average performance of the proposed roundabout increases by 40% and 41.8% in comparison with the statutes in 2016, 2017 and beyond, respectively. The proposed roundabout is 41% safer than the status in 2016, and the accident risk is lower by 18.5% than the current status.
Highlights
The growth of population, technological advances and correspondingly the increasing number of vehicles induce the insufficiency of roads in many countries
The analyses reveal that the proposed roundabout is far more successful when compared to the former roundabout types
This study has analysed and compared 3 roundabout type statuses, which are the status in 2016, current status and the status of the proposed intersection, for the signalised roundabout located in Antalya, Burhanettin Onat Street–Metin Kasapoglu Street, that is Sampi intersection, using AIMSUN
Summary
The growth of population, technological advances and correspondingly the increasing number of vehicles induce the insufficiency of roads in many countries. To provide more comfortable and fast transportation, the parameters such as the systems of transportation, the routes, types of junctions and the traffic signalisation should be evolved. One of the most important parameters having effect on the traffic flow is the intersection where two or more traffic flows coming from different directions meet, cross or diverge. Since each vehicle involved in an intersection performs a series of different manoeuvres, there is a quite high possibility of an accident. Some road safety controls are performed at intersections in order to prevent the occurrence of an accident. Location of a central island and signalisation are some of the traffic audit techniques, which yields to the concept of roundabout
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
