A Spatial Analysis for Detecting Highway Traffic Accident Hotspots-Case of Istanbul

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Dündar S., Soydan Y., Yardım M. S.

ACE 2020-21 14th International Congress on Advances in Civil Engineering, İstanbul, Turkey, 6 - 08 September 2021, vol.1, pp.1346-1353

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.1346-1353
  • Yıldız Technical University Affiliated: Yes


Highway traffic accidents are amongst the biggest social problems experienced in today’s world. Various stakeholders, such as central and local governments, public institutions and organizations, non-governmental organizations, academicians are working to reduce the number and the severity of traffic accidents. For this purpose, new control methods are being developed in addition to new technologies such as autonomous vehicles.

Within the scope of this study, the accidents in Istanbul in 2018 were examined using Qgis, an open source geographic information system (GIS) software. After the spatial data related to the accidents occurred were defined in the Qgis software, accident hotspots where the number of accidents intensified were determined. By focusing on these points a spatical analysis has been made by examining the types of accidents and the factors affecting the at a micro level.

It can be said that various factors such as traffic volume, speed, geometric features of the road, lighting level, etc. are effective in the accidents that took place in Istanbul in 2018. On the other hand, some factors that cannot be detected within the scope of the study developed such as a temporary road work can also be found among the factors of accidents.

As a result of the developed study, the improvements that can be made at the accident hotspots in order to reduce accidents are examined and presented as a suggestion.

Keywords: Traffic accident, hotspots, spatial analysis, geographic information system, Istanbul.