Example: Understanding Ramp Metering
Ramp metering is a classic ATMS application that often confuses the public because it intentionally delays drivers on the on-ramp.
Example
Scenario:
A basic three-lane freeway segment has a theoretical capacity of 6,000 vehicles per hour (vph). During the morning peak, the upstream mainline traffic is 5,200 vph. An on-ramp is discharging traffic onto this segment at a rate of 1,000 vph.
Analysis: The Impact of Ramp Metering
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Example: ITS Benefit Estimation
A conceptual case study demonstrating the quantitative value of ITS deployment.
Example
Problem Statement:
A city installs an Adaptive Traffic Signal Control (ATSC) system on a major arterial. Prior to installation, the average intersection delay was 45 seconds per vehicle. After installation, the delay was reduced by 20%. If 50,000 vehicles travel the arterial daily and the average Value of Time (VOT) is $15/hour, calculate the total annual cost savings for commuters (assume 250 working days per year).
Given:
- Initial Delay = 45 seconds/veh
- Delay Reduction = 20%
- Daily Volume = 50,000 veh/day
- VOT = $15/hr
- Days = 250/year
Step-by-Step Solution
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