SR 91 at I-4 SR 400 Interchange Improvements
The Turnpike Mainline/I-4 Interchange provides for the movement of tens of thousands of vehicles per day, connecting these two major transportation corridors in the heart of central Florida.
The Middlesex Corporation’s Design-Build Team designed and constructed the widening of Exit Ramp K, Entry Ramp A, and Exit Ramp C all to two lanes. This included the construction of a new bridge for the new Ramp C alignment, parallel to the existing bridge that has carried both Ramp A and Ramp C traffic in single lanes since originally constructed.
The new bridge contains 3 spans of approximately 104’, 99’, and 94’ and accommodates 2 13’-6” wide lanes, a 6’ inside shoulder, and a 10’ outside shoulder. The span configuration accommodates the full Turnpike Typical Section while adding an additional span to bridge the Florida Gas Transmission line.
By the Numbers
Embankment 78K CY
MSE Walls 19.4K SF
Ramp Construction 10.5K LF
Project Value $11M
Scope of Work
- 3-span bridge parallel to existing bridge
- Widening of existing ramps
- Construction of bridge structure for a 2-lane exit ramp
- MSE walls
- Pavement markings
- Overhead sign structures
- Lighting, signs, and fiber optics
- Milling and resurfacing
- Traffic Control Plan
Unique Challenges
- Interchange’s proximity to unique 12-mile segment of the Turnpike that includes 4 system interchanges and the Turkey Lake Service Plaza
- Construction over a primary traffic artery (SR 91/ Turnpike) with an ADT of 57K.
- Revision of FGT’s utility easement which was instituted after Middlesex was awarded the project; this affected the project’s critical path and schedule
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