The bar chart compares the traffic accidents per kilometer on five motorways in Bridgewater before and after the addition of extra lanes to busy roads.
Overall, implementation of extra lanes led to decline in accident rates of all motorways, but improvement differed greatly. Notably, most reduction occurred on M5, while M3 showed only a slight improvement.
Before the introduction of extra lanes, M2 and M5 recorded most accidents per kilometre, both at nearly 17, while M4 followed with around 13. By contrast M4 and M3 had the lowest rate of accidents, 7 and 4 respectively.
Following the changes, traffic accident figures fell across all motorways. M2 remained the highest at 15 by just falling by 2 figures. However M5 and M3 saw the significant decline by 10 and 8 accident rates correspondingly. Meanwhile M3 and M4 dropped slightly to 2. The smallest ruduction was on M3 which fell steeply to just 2.
