The three pie charts present detailed proportions of various types of transportations applied in main road bridges in UK over three distinct years. Overall, the portion of private cars experienced a consistent increase, while they dominated the largest share. In contrast, public transport vehicles were taking up a decreasing amount of percentage in main road bridges.
From the first chart, in 1965, up to 45 percent of the entire amount of vehicles in major road bridges were taken up by private cars, followed by the public transport vehicles, with 27 percent. The share of lorries or other commercial vehicles (24 percent) constituted around the same amount as that of public transport. The recreational vehicles accounted for the least percentage, with only 4%.
Turning to the other two charts, it was clearly that over the four decades the private cars witnessed a soar in the proportion, with 55% in 1985 and up to 74% in 2005, which almost occupied three fourth of the entire amount of vehicles. In contrast, the share of public transport progressively declined to 14% in 1985 and only 6% in 2005. Similarly, a downward trend happened to the commercial cars such as lorries, which decreased by 13% from 1965 to 2005, despite a slight fluctuation over these years. As for the recreational cars, though it constantly remained the least share, it displayed the most stable percentage among these four types of vehicles.