Highway Research Record

VI. RESEARCH WORK DONE IN ACADEMIC INSTITUTIONS RELATED TO THESIS WORK
C. TRAFFIC AND TRANSPORTATION
Evaluating Safety Performance of Other District Roads (ODRs) in Kerala: A case study

Date of Start: January 2005,
College of Engineering, Trivandrum (R, I)

Scope and Objective
(i) To identify major deficiencies responsible for hazardous situations and to prepare checklists for Road Safety Audit Review in      Other District Roads.
(ii) Using these checklists, identify potential safety problems in the study stretch for road users.
(iii) Define different risk levels based on severity and frequency of accident occurrence.
(iv) Develop Hazard Rating Score (HRS) for individual km. of the study stretch and intersections within the study stretch.
(v) Develop Hazard Ratios (HR) to compare the safety performance of individual km. of the study stretch with respect to      average performance and to prioritise sections with respect to their accident proneness.
(vi) To analyse the accident details of the study stretch and to develop a statistical relationship between HRS and total       number of causalities.


Methodology
The methodology of this study consists of three parts
1) Data base
Checklists have been filled with primary data like alignment details, traffic details, road furniture, intersection details etc. by conducting detailed site visit. Accident details for a period of 3 years, which is the secondary data, have been collected from the Traffic Police Department.
2) Development of Hazard Rating Score (HRS)
Based on accident severity and frequency of accident occurrence, a numerical value called Risk Weighting has been developed to quantify the apparent risk to road users due to different safety factors. A Risk Matrix has been developed consisting of accident severity and frequency of accident occurrence. The row values were the severity weightings and each of these row values were multiplied with corresponding column values i.e. frequency weightings. The obtained weightings have been clustered based on their numerical values. The final risk weightings obtained based on the ratio of the means of numerical values of each cluster. Based on these final risk weightings, different risk levels were defined. The risk level for each parameter in the checklist has been found out from field visits and corresponding risk weightings were assigned to each parameter for every kilometre of the study stretch. Hazard-rating score (HRS) is the sum of risk weightings of each parameter in the checklist.
3) Statistical analysis
A statistical relationship between HRS and total causalities at each kilometre stretch has been developed.

Findings and Conclusions
HRS for each kilometre of the study stretch and intersections within the study stretch has been obtained. From this HRS, Hazard Ratios have been derived to compare the safety performance of individual kilometre of the study stretch with respect to average performance. A statistical relationship between HRS and number of casualties is also developed to compare the HRS with real life accident situation.

Report/Publication
Deepa R. (2005), “EVALUATING SAFETY PERFORMANCE OF OTHER DISTRICT ROADS IN KERALA – A CASE STUDY”, M.Tech Thesis, Traffic and Transportation Engineering Division, Department of Civil Engineering, College of Engineering, Trivandrum