Characteristics of cloverleaf interchange in Turkey

Yalçın, Esra Gözde
Level of Service (LOS) is a qualitative key attribute for monitoring traffic performance of road infrastructure. As interchanges are major but rather limited designs in road networks, providing uninterrupted flow with high capacities, there is a no LOS concept developed for them. However, data collection capability via Bluetooth (BT) readers located at interchange approaches make it possible to collect continuous speed and travel time data for all possible movements, which can lead to a measure for LOS for interchanges, which is the main focus of this thesis. As a trial case BT readers were located to monitor traffic flows through a cloverleaf interchange in urban road network in Ankara during peak hours. Another cloverleaf interchange in Konya was accessorized with BT readers for a full-day observation. The results showed that while it was possible to monitor LOS for some of the movements in the interchange via BT reader data, some movements did not have enough readings in all time interval. Average speed reduction during peak periods was detected in the BT matching data, providing a promising outcome for future LOS development for cloverleaf interchanges.


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Accurate estimation of queue lengths whether in the approach of a signalized intersection or near a bottleneck location along an uninterrupted urban arterial is essential for better traffic management. This requires reliable traffic data, which is traditionally obtained from loop detectors, video cameras, etc. More recently, Floating Car Data (FCD) is being increasingly used as an alternative traffic data source due to its lower cost and high coverage area. Commercially available FCD is obtained from GPS eq...
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Citation Formats
E. G. Yalçın, “Characteristics of cloverleaf interchange in Turkey,” M.S. - Master of Science, Middle East Technical University, 2018.