The process of transportation planning include ____. （ ）
选项：

A:establishing a vision of what a community wants to be and how the transportation system fits into this vision
B:understanding the type of decisions that need to be made in order to achieve this vision
C:assessing opportunities and limitations of the future in relation to goals and desired system performance measures
D:identifying the near- and long- term consequences to the community and to transportation user systems of alternative choices