Sample answer
The pie charts show the changes in the proportions of pkm for a range of different forms of transport every thirty years between 1990 to 2050 along with the total number of passenger kilometres.
Overall, the total passenger traffic miles are likely to double in every 30 years, increasing from 23.4 trillion to 53 trillion and 103 trillion pkm in 1990, 2020 and 2050 respectively. Meanwhile, the proportions of buses, automobiles, railways and high-speed transport tend to be varied in trends.
With regard to cars, it is estimated that the proportion of this vehicle will have fallen from 53% in 1990 to 35% by the year 2050. Buses and railways also show similar downward trends in proportions of traffic volume but with much slower pace than that of automobiles, in which railway transport will have decreased by over half and buses will have reduced by almost 10% by 2050.
Turning to high-speed transport, only this kind of vehicle witnesses a significant rise, in which its figure is expected to reach 25% in 2020, nearly triple that of 1990 and then double to 41% in the final year. High-speed means of transportation are anticipated to become the most popular vehicle in 2050.
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