The study supported the currently planned ramp meters by developing a state-specific method that can be incorporated into the NCDOT planning processes to evaluate any potential ramp metering projects in the future. The related frameworks of analysis were applied to the four westbound I-540 ramp meters to estimate the expected outcomes of the project. The I-540 analysis and frameworks resulting from this study focus on four major steps in the ramp metering process: 1) planning-level data collection, 2) planning-level analysis, 3) life cycle cost analysis, and 4) before-and-after installation evaluation. Ultimately, the research team found that westbound I-540 ramp meters will provide estimated benefits of between $28,234,500 and $73,410,500 over the next ten years. The project produced a sound foundation for evaluating ramp metering outcomes on which the state can build a ramp metering program that is both sustainable and efficient.
