This report highlights the statistical analysis of MIROS’s in-depth crash investigation cases throughout the year of 2011–2013. The main objective of this report is to provide the result of the descriptive analysis, inferential analysis and indexes on casualties of crash investigation cases of the said year. From 2011 until 2013, MIROS’ crash investigation team investigated 167 cases regarding the crash that meets the MIROS’s specific requirements. The number of investigated cases for each year of 2011, 2012 and 2013 is 68 cases, 44 cases and 55 cases respectively. For each year more than 50% of the crash cases involved two vehicles. The proportion of crash involving passenger car which included car, four wheel drive, van and MPV is significantly higher compared to another vehicle type. In terms of crash configuration, head-on collision recorded the highest proportion compared to others. A high number of investigated cases tend to occur on the midblock road compared to the other types of intersection.
The inferential analysis shows some parameters have significant relationships with other variables. This includes horizontal and vertical alignment, road type and crash configuration, the number of vehicles and crash configuration. On a vertical slope road, the likelihood for an accident to happen in the horizontal bend road is 7.381 higher than in horizontal straight road. The analysis showed that KSI Index is high on Wednesday, the time between 1401 to 1600, the month of August, Sarawak, vicinity of construction, a night without street light, during light rain, in private road, crossroad intersection, straight and slope road alignment, single carriageway, cases involved rollover and single vehicle. Fatality index has also shown that the highest number of the parameters listed above except for staggered intersection instead of a crossroad. Risky driving and speeding are found to be the most identified crash occurrence factors in the investigated cases year 2011–2013. Meanwhile for injury occurrence factors, crash compatibility was found to be more prominent in each variable analysed.