Abstract
In the Slovak republic, there is an increase of building roundabouts in both urban and non-build-up areas. The construction of roundabouts in urban areas brings mainly calming of traffic intensity. A roundabout in non-build-up areas could be built only within certain conditions. In this paper, we have been studying a small roundabout location and its traffic characteristics in the city of Hlohovec. In some cases, a small roundabout could be very good solution for exceeded traffic flow capacity of signal controlled intersections as well as for intersections with a high number of traffic incidents. But in our case, a small roundabout is not suitable for such intensity of vehicles as we measured in transport survey. So we focused on other possibilities how to improve this current situation. We have decided to make a proposal of signal controlled intersection as well as a turbo roundabout and compare the results of traffic characteristics of each proposal. We have made several simulations of each variant of traffic situation, using transport-planning software Aimsun, and calculate average values of all recorded traffic characteristics. As inputs, we have used intensities and other basic data obtained from transport survey. Using simulations outputs of transport planning software, we have been able to compare a current state with signal controlled intersection and turbo roundabout. Traffic characteristics of turbo roundabout show significant improvements compare to signal controlled intersection, f.e. in delay time (more than 68 %), travel time (more than 22 %), number of stops (more than 73 %). Turbo roundabout seems to be the best solution for traffic organising at this chosen intersection in the city of Hlohovec, regarding travel time, delays, number of stops and safety at all.
Highlights
The city of Hlohovec representatives have asked our university to make a transport survey on the selected small roundabout because of rising intensities and related congestions
The best solution for current state of traffic situation on the small roundabout is to change the organization of traffic on turbo roundabout
It is possible to conclude, based on the simulation outputs, that traffic is smoother in case of turbo roundabout
Summary
The city of Hlohovec representatives have asked our university to make a transport survey on the selected small roundabout because of rising intensities and related congestions. Residents of the city complained on traffic situation – long time in congestions, overloaded adjacent roads, often delays of public transport. This type of intersection should not be situated on I. class roads and roads with high intensity because of small capacity and permeability of small roundabout. The entrance number 1 consists of road II/513, where a high intensity of traffic occurs because this communication represents an important transit route from/to Leopoldov, Trnava, Sereď and connection to D1 highway. The entrance number 3 represents an exit from Hlohovec in one way and in opposite direction you can get Hlohovec city through the bridge over the river Váh. Using the entrance number 4 you can get to hypermarket Tesco and shopping centre called Váh, which is visited by many inhabitants of the nearby towns and villages, whether for shopping or work duties
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