Traffic Simulation Laboratory

The core of the evaluation process is the traffic simulation laboratory (SIMLAB) which consists of a traffic flow simulator (MITSIM) and a traffic management simulator (TMS). The traffic flow simulator models the driver behavior and vehicular flow in the network, while the traffic management simulator mimics the control and routing functions performed by the particular system under evaluation. The simulation laboratory is designed to:

1. represent a wide range of traffic management systems;
2. model drivers' response to real-time traffic information and controls; and,
3. incorporate dynamic interactions between the traffic management system and the drivers in the network.

The interaction between the traffic flows in the network and the control and route guidance generated by the system is a critical element for modeling dynamic traffic management systems. Traffic control and route guidance affects the behavior of individual drivers and, hence, traffic flow characteristics. The changes in traffic flows are in turn measured and potentially anticipated by the system and consequently influence present and future control and routing strategies. This simulator provides laboratory environment for the coupling of traffic control and routing logic with traffic flow. This system is a useful tool for testing and evaluating new concepts, algorithms, and technologies in research and development of ITS applications.

Figure 2-2 presents the main components of the simulation laboratory and their relationships. The functionality of the traffic simulation laboratory is provided by the following elements:

(1)

traffic flow simulator;

(2)

traffic management simulator;

(3)

surveillance system; and,

(4)

control and routing devices.

  
Figure 2-2: Simulation framework for dynamic traffic management

The traffic management simulator represents the candidate traffic control and routing logic under evaluation. The control and route guidance provided by the traffic management system feed into the traffic flow simulator via various traffic control and routing devices in the simulated network. Drivers in the network respond to the traffic controls and guidance while interacting with one another. The outcome of the drivers' behavior is observed by the surveillance system module representing traffic sensors and probe vehicles. This module provides the traffic management simulator with the measurement of real-time traffic conditions.

• Traffic Flow Simulator
  • Network components
  • Travel demand
  • Driving behavior and vehicle movement
• Traffic Management Simulator
• Surveillance System
• Control and Routing Devices