The City retained CPC to conduct a traffic study to determine the impact of the potential bridge demolition. Travel time analysis was completed and operational analysis within the area to determine the level of congestion if the bridge is demolished. A detailed cost estimate was prepared based on bridge replacement alternatives.
To initiate the study traffic data collection was ordered at several locations. Developed existing traffic conditions for the AM and PM peak hours and developed traffic conditions for the AM and PM peak hours assuming Bridge decommission. Performed Travel Time under bridge decommissions condition. CPC obtained travel time using the detour route assuming the bridge is no longer in place. This data allowed CPC to calibrate the traffic analysis software, Synchro, to simulate the decommissioned condition using SimTraffic simulation model. This model is a great visual tool for public information. The model was used to show traffic movement within the area to assist the community to understand the impact of the bridge decommission. CPC evaluated the Bridge Replacement impact based on geometric condition, design, and elevations. CPC considered the design criteria for a new bridge or a rehabilitated bridge to determine the impact on adjacent properties. Potential impacts include additional right-of-way, construction temporary easements, retaining walls causing visual impact, and access to existing driveways. CPC developed a Synchro Model existing traffic condition for the AM and PM peak hours. Developed traffic conditions for the AM and PM peak hours assuming Bridge decommission. Traffic analysis using Synchro Model, tabulate travel time and delay under existing and proposed bridge decommission condition. Compared travel time and delay calculations to determine bridge decommission condition impact. The traffic analysis report was completed. Cost estimates for various alternatives were developed using recent similar bridgework.
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