METANET Model Improvement for Traffic Control

Variable Speed Limits (VSL) and Coordinated Ramp Metering (CRM) are the main control strategies for freeway traffic. Model-based control design for CRM requires density (or flow) dynamics with the onramp inflow rate as the control variable; and the VSL design requires speed dynamics with the desired speed as the control variable. The METANET model provides a suitable structure for this control design, but previous work with METANET parameterized the speed control variable to be highly nonlinear, which caused difficulty in control design and implementation. Furthermore, the previous METANET model could not catch quick and significant changes in traffic dynamics. Therefore, the dynamics model itself needs improvement. This paper suggests improvement in two aspects: (a) drop the nonlinear parameterization in the speed control variable and directly use linear control, which greatly simplifies the control design; and (b) propose several alternatives for the convection term of the speed dynamics to improve model matching. Model calibration using Berkeley Highway Lab (BHL) field data and simulation for comparison are presented to show the effectiveness of the improvements.

Language

  • English

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  • Accession Number: 01600929
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 17 2016 7:58PM