Area chart showing the proportion of serious, minor, and no injury incidents on Transurban roads from 2015 to 2021. There are coloured areas for rear-end, out-of-control, side swipe, and object-hit crashes, as well as a coloured area for all other crash types. The proportion of crashes varies each year. The most number of crashes took place in 2017 and the least number in 2020. The total number of crashes has decreased steadily since 2017.