According to the graph, we can see that the number of car accidents in Chongqing city fluctuated considerably during the year 2011. The first two months of 2011 showed an increasing trend, moving from 22 accidents in January to 32 in March. Accidents decreased steadily over the following 3 months to only 26 incidents in June. The months of July and August saw a second sudden increase, numbering 33 and 39 accidents respectively. After August the situation steadily improved, with accident numbers declining to a minimum of 16 in December.
These fluctuations can be explained by weather and road conditions. The increase in accidents evidenced in March can be attributed to the excessive rain that comes in early spring, making the roads muddy and slippery. The peak in accidents in August is related to the heat and humidity of the summer months, making drivers drowsy and impatient. Improved weather conditions and the completion of two new roads obviously improves traffic and driving conditions in the autumn and winter months, leading to the strong decline of accidents during that period.
Based on the information presented in this graph, I would expect the following year to have similar fluctuations in its numbers of accidents, in variation with the weather. However, I would also expect the overall number of accidents to be lower due to the existence of two new roads, therefore improving the traffic conditions all year round.