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I-215 and Keller Road Interchange
Cal Poly Pomona Senior Project
Benefit/Cost Analysis
Cost Estimates
In order to properly compare all viable alternatives, a benefit cost analysis was conducted. First, cost estimates were calculated for each alternative interchange design using the Caltrans Database. The total cost was a summation of the Support cost, Right-of-Way cost, Roadway Construction cost, Bridge cost, and Contingency cost. Below is a summary of the total cost for each viable alternative.
Cost Estimates
Benefits
The benefits were then calculated for each alternative. This is a tangible benefit that is based on the cost of emission and cost of delay for each alternative and then compared to the cost of emission and cost of delay for the No-Build scenario; both costs were compared in the two scenarios to obtain emission and delay reduction values. The emission costs were calculated using Caltrans Emission Costs for California Urban Areas and the delay costs were calculated using Caltrans Hourly Value of Time. Below is a summary of the total benefit which each alternative provides.
Benefit/Cost Analysis
To conclude the benefit/cost analysis, the total cost for each alternative was then compared to the total benefit by dividing the benefit with the cost. This provided a benefit/cost ratio, or a B/C ratio. This ratio is able to determine whether an alternative or a specific project is economically viable or not, with a ratio equal to or greater than 1 being sufficient. In other words, the ratio compares the total cost or amount of money invested into the project and is compared to the benefits that the alternative is able to produce. The table below summarizes the ratios obtained for each alternative. All ratios are above 1, which means all alternatives are economically viable and are ideal to be built for the project area.
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