NE T WORK ANALYS I S GIBSONTON AREA 4.3 Network Performance of Each Alternative Set
westbound direction between US 301 and East Bay Road. However, Alternatives 2 and 3, see a shift in approximately 350 vehicles from Symmes Road to other roadways such as Gibsonton Drive and Cone Grove Road, the latter having new northbound left access from US 301 under these two alternatives. The remaining vehicles travelling westbound on Symmes Road in the AM peak period are destined for areas west of I-75, such as US 41 or various neighborhoods and businesses. Delay results are similar between all three results, with the exception of the US 301/Symmes Road and Boyette Road/Balm Riverview Road intersections, and the Mathog Road and Alafia Trace Boulevard intersections along Gibsonton. Minor signal timing adjustments, along with the combining of the two closely spaced intersections on Gibsonton, result in some delay improvements on the approaches with the highest delays in the E+C Model.
Similar to the analysis completed for the E+C Model, the volume to capacity (V/C) ratios and approach and overall intersection delays were calculated for the AM and PM peak periods for each of the alternative sets. Table 5 provides a summary of the findings for each of the alternative sets. Detailed results for Alternative 1 are shown in Figures 25 to 29 and Table 6. Detailed results for Alternative 2 are shown in Figures 30 to 34 and Table 7. Detailed results for Alternative 3 are shown in Figures 35 to 39 and Table 8. Generally, the results show that individual projects included in all of the alternatives provide a benefit in some way, without causing a corresponding detriment on another roadway. In all alternatives during the AM peak period, Symmes Road continues to be congested in the
Table 5.
Alternative Set Comparison Project Summary
Alternative Set
Issues Addressed
Model Results
Alternative Set 1
Additional capacity on US 41 and Gibsonton Drive reduces these heavily congested roadways to uncongested levels. In the AM peak period, the additional capacity on Gibsonton Drive draws some traffic away from the Symmes Road-East Bay Road route, but not enough to reduce congestion on Symmes Road and East Bay Road to uncongested levels. Overall intersection delay is generally improved, especially along Gibsonton Road, partly due to providing updated signal timing to reduce side street delay. Providing an additional connection between Cone Grove Road and Gibsonton Drive, as well as provding a northbound left turn access from US 301 to Cone Grove Road, r emoves a small amount of vehicles away from Symmes Road. However, Symmes Road continues to experience high volumes . Combining the Mathog Road and Alafia Trace Boulevard intersections does not diminish operations of the combined intersection. Provides similar results to Alternative Set 2. Improvements to the US 301/Symmes Road and Gibsonton Drive/Balm Riverview Road signal timing plans improves the approach delays to more acceptable levels, but does not improve the overall imtersection delay compared to Alternative Set 2.
Addresses congestion on US 41 and Gibsonton Drive, while also improving access to northbound I-75.
Alternative Set 2
Addresses congestion on US 41 and Gibsonton Drive, while also improving access to northbound I-75. New local road connections provide additional routes for vehicles exhibiting delay along major roadways. Addresses congestion on US 41 and Gibsonton Drive, while also improving access to northbound I-75. New local road connections provide additional routes for vehicles exhibiting delay along major roadways.
Alternative Set 3
Summary Report
36
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