According to information from the graph, there is reduction in number of accidents per kilometer in Bridgewater in every road, that is associated with introduction of extra lanes. As it is displayed in chart, roads M2 and M5 used to have the biggest amount of accidents before creation of new lanes – about 17 of those per kilometer.
On the other hand, roads M3 and M4 are seems to have much less car crashes – not exceeding 8 crashes per kilometer.
The information from pie chart shows, that most significant decline in number of accidents, roughly for more than a half, can be seen in roads M5, M1 and M4. Summing up, they cutted off more than 23 car accidents per kilometer.
Countrerely, M2 road showed the lowest decline in car crashes – only 2 cases per kilometer. Eventhoug, M3 road is having same drop, in context of its previous amount of accidents, it is a half reduction.