Pre-crash scenarios at road junctions: A clustering method for car crash data

Philippe Nitsche, Rainer Stütz, R. Welsh, P. Thomas

Research output: Contribution to journalArticlepeer-review


Given the recent advancements in autonomous driving functions, one of the main challenges is safe and efficient operation in complex traffic situations such as road junctions. There is a need for comprehensive testing, either in virtual simulation environments or on real-world test tracks. This paper presents a novel data analysis method including the preparation, analysis and visualization of car crash data, to identify the critical pre-crash scenarios at T- and four-legged junctions as a basis for testing the safety of automated driving systems. The presented method employs k-medoids to cluster historical junction crash data into distinct partitions and then applies the association rules algorithm to each cluster to specify the driving scenarios in more detail. The dataset used consists of 1056 junction crashes in the UK, which were exported from the in-depth "On-the-Spot" database. The study resulted in thirteen crash clusters for T-junctions, and six crash clusters for crossroads. Association rules revealed common crash characteristics, which were the basis for the scenario descriptions. The results support existing findings on road junction accidents and provide benchmark situations for safety performance tests in order to reduce the possible number parameter combinations.
Original languageEnglish
Pages (from-to)137-151
Number of pages15
JournalAccident Analysis and Prevention
Issue number107
Publication statusPublished - 2017

Research Field

  • Not defined


  • Automated cars
  • road safety
  • intersections
  • clustering
  • car crashes
  • pre-crash scenarios


Dive into the research topics of 'Pre-crash scenarios at road junctions: A clustering method for car crash data'. Together they form a unique fingerprint.

Cite this