As of my last update in September 2021, VISSIM is primarily designed for three-dimensional (3D) traffic flow simulation and does not directly support two-dimensional (2D) traffic flow. For 2D traffic simulation, consider exploring other software options like AIMSUN or SUMO. Be sure to check for any updates or new versions of VISSIM or other software that may have been released since my last knowledge update.

Thank you so much for your reply.

Yes, it is possible to simulate 2D traffic flow using VISSIM. VISSIM is a microscopic traffic simulation software that can be used to simulate traffic flow on a variety of road networks, including 2D networks. To simulate 2D traffic flow in VISSIM, you will need to create a 2D road network in the software. You can do this by importing a 2D map or by creating the network manually. Once you have created the network, you can then add vehicles to the network and simulate traffic flow.