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Unformatted text preview: Lecture 7 Lecture 7 Freeway Traffic Control: Freeway Traffic Control: Pre Pre-timed, Coordinated Ramp Metering timed, Coordinated Ramp Metering Prof. Prof. Ismail Ismail Chabini and Prof. Chabini and Prof. Amedeo Amedeo R. R. Odoni Odoni 1.225 1.225 J (ESD 205) Transportation Flow Systems J (ESD 205) Transportation Flow Systems 1.225, 11/20/02 Lecture 7, Page 2 Lecture 7 Outline Lecture 7 Outline ¡ Introduction: • Freeway traffic control • Ramp metering ¡ Pre-timed, coordinated ramp metering (R11, R13) • Example • LP formulation for the example • General LP formulation ¡ Summary 1 1.225, 11/20/02 Lecture 7, Page 3 Freeway Traffic Control Freeway Traffic Control ¡ Lane control: • Variable speed limit signs • Keep-lane signs • Congestion and incident warnings • Environmental condition warnings, such as fog, ice, rain and snow ¡ Freeway network control: • Variable Message Signs (VMS) for driving information and/or guidance • Individual route guidance ¡ Two types of freeways: Urban freeways and Intercity freeways ¡ Ramp metering is applicable to urban freeways due to: • Large number of on and off ramps • Many ramp-to-ramp trips • Recurrent as well as non-recurrent (usually dynamic) congestion 1.225, 11/20/02 Lecture 7, Page 4...
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This note was uploaded on 12/06/2011 for the course ESD 1.225j taught by Professor Ismailchabini during the Fall '02 term at MIT.
- Fall '02