Spatio-Temporal Analysis of Road Accident Incidents and Delineation of Hotspots Using Geospatial Tools in Thrissur District, Kerala, India

  • Ashokan Laila AchuEmail author
  • C. D. Aju
  • Vipin Suresh
  • Thushara P. Manoharan
  • Rajesh Reghunath


Accidents are distressing experiences which affect physical, psychological, and social welfare of clans. Road accident fatalities are increasing in Kerala due to the traffic congestions and increase in both population and number of vehicles. The present study investigates the spatial and temporal patterns of the road accidents from 2013 to 2015 in Thrissur district, Kerala using geospatial technology. Assessment of spatio-temporal clustering of road accidents was carried out using Moran’s I method of spatial autocorrelation, Getis-Ord Gi* hotspot analysis, and Kernel density functions. The year wise total accidents show a clustered pattern, whereas the spatio-temporal breakup of events shows random and clustered distribution in certain classes. The continuous road stretches and isolated zones of hotspots and cold spots were delineated by the Kernel density surface using the results of Getis-Ord Gi* hotspots analysis. Four major road segments such as National highway near Kodungallur to Althara stretch, Thrissur town to Perumpilav stretch via Kunnamangalam, Thrissur town to Vadanappally segment, and Guruvayur to kunnamangalam stretch are identified as highly clustered accident hotspots. The results of this study can be effectively used by local self-governments, police departments, as well as national agencies for implementing better road safety policies in the accident hotspots stretches.


Spatial autocorrelation Road accident hotspots Spatio-temporal clustering Getis-Ord Gi* Moran’s I Kernel density functions 

Spatio - zeitliche Analyse von Verkehrsunfallereignissen und Zeichnung von Hotspots mit Georaumwerkzeugen im Bezirk Trissur, Kerala, Indien


Unfälle sind schmerzliche Erfahrungen, die physische, psychologische und soziale Konsequenzen haben können. Fatale Straßenunfälle steigen aktuell in Kerala, bedingt durch Verkehrsstau und steigenden Zahlen der Bevölkerung und Fahrzeugen. Die vorliegende Studie untersucht räumliche und zeitliche Muster von Straßenunfällen zwischen 2013 und 2015 im Distrikt Thrissur im (südindischen) Bundesstaat Kerala. Basierend auf räumlichen Autokorrelationsmethoden nach Moran’s I (Getis-Ord Gi* Hotspot-Analyse und Kernel-Density-Funktionen) werden raumzeitliche Cluster von Straßenverkehrsunfällen ermittelt. Die jahresweisen Anzahlen an Unfällen zeigen geclusterte Muster, wohingegen die raumzeitliche Ereignisaufteilung sowohl zufällige als auch geclusterte Verteilungen hinsichtlich bestimmter Klassen ergibt. Ununterbrochene Straßenverläufe und isolierte Zonen an Hotspots und ‚Coldspots‘ werden basierend auf Kernel-Density-Analysen dargestellt. Insgesamt wurden vier Hauptstraßensegmente als Hotspots für Verkehrsunfälle identifiziert. Die Ergebnisse dieser Studie können effektiv in kommunalen Selbstverwaltungen, Polzeidirektionen und staatlichen Sicherheitsbehörden eingesetzt werden.


Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Deutsche Gesellschaft für Kartographie e.V. 2019

Authors and Affiliations

  1. 1.International and Inter University Centre for Natural Resources ManagementUniversity of KeralaThiruvananthapuramIndia
  2. 2.Department of GeologyUniversity of KeralaThiruvananthapuramIndia
  3. 3.Inter University Centre for Geospatial Information Science and TechnologyUniversity of KeralaThiruvananthapuramIndia

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