This paper describes a study in which the dynamic 3-Dimensional ASsignment (3DAS) model is used as a planning tool. The Virginia part of the Washington Metropolitan area was chosen as a study area. The primary objective of this study is to find answers to the following three questions: (1) Can dynamic assignment be used for planning purposes; (2) Is there an advantage of dynamic assignment above static assignment; and (3) is dynamic assignment a useful tool to investigate the effects of Advanced Traffic Management Systems (ATMS)? The secondary objective of the study is to gain insight into the possibilities and problems associated with the 3DAS application to larger networks. In order to answer these questions, four scenarios are considered: (i) the morning rush-hour scenario; (ii) the static assignment scenario; (iii) a scenario with ramp metering at several on-ramps; and (iv) the accident scenario. The study shows that using dynamic assignment for planning purposes can be very helpful. The results give more detailed information about the occurrences of traffic jams than static assignment methods can give. Introducing ATMS measures to alleviate congestion can be simulated, and all kinds of evaluations are possible. Influences of ramp metering and rerouting on travel time and jam length can be investigated.
Samenvatting