The Relationships Between iRAP Star Rating Score and Various Safety Performance Indicators

Abstract

The iRAP Star Rating assessment has gained global recognition as an effective strategy for reducing fatalities caused by road crashes. As part of its road safety initiatives, Indonesia has also adopted the iRAP Star Rating methodology with the goal of achieving a 3-Star Rating or higher for over 75% of its road network, with a focus on prioritizing toll roads. However, it remains crucial to ascertain the effectiveness of the iRAP Star Rating methodology with regards to safety performance indicators such as crash and fatality rates and the number of crashes and fatalities. Unfortunately, there have been limited studies examining the relationship between safety performance indicators and iRAP Star Rating, with only a few conducted in Indonesia. Most of these studies only focused on iRAP Star Rating results and used a limited dataset without examining correlations to safety performance indicators. Thus, this study aims to estimate the relationship between the iRAP Star Rating Score (SRS) and safety performance indicators. The results indicate a positive correlation between SRS and safety performance indicators, with a higher SRS indicating a higher level of hazard and correspondingly higher safety performance indicators values. However, it is important to note that the R2 value was not particularly high (ranging from 0.2-0.7), suggesting that this relationship may not be accurately reflected, possibly due to factors unique to the Indonesian environment and human factors not specifically accounted for in the iRAP methodology.

Keywords

• crash rate
• fatality rate
• irap star rating
• star rating score (srs)
• toll road