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The Seminole Expressway/SR 417 in Seminole County, FL, serves as a crucial emergency evacuation route and a major segment of the eastern beltway around Orlando. This vital corridor offers an alternative to the busy Interstate 4, catering to both commercial and private transportation. The Cross Seminole Trail also crosses over the project area in two places.


The project involves widening six miles of the Seminole Expressway/SR 417 from four lanes to eight travel lanes—adding two new lanes in each direction—from the Orange County line to north of SR 434. Additionally, it includes enhancements to the interchange and existing ramp terminal intersections at Aloma/SR 426, Red Bug Lake, and SR 434. Additional work includes pavement milling and resurfacing, drainage pond, bridge widening, bridge reconstruction, and roadside safety enhancements.

To complete the work, the current number of lanes needs to be maintained throughout the duration of construction. To achieve this, traffic will be temporarily shifted onto temporary pavement, as well as permanent pavement over the course of construction. Work that impacts traffic must be performed during overnight hours.

Technical Highlights

  • Widening six miles of the roadway from four lanes to eight travel lanes—adding two new lanes in each direction
  • Enhancements to the interchange and existing ramp terminal intersection
  • Pavement milling and resurfacing
  • Drainage pond
  • Bridge widening and reconstruction
  • Roadside safety enhancements


  • Reduction to the amount of reconstruction overall, and the associated work and resources required.
  • Our team’s innovative configuration of the interchange at SR 417 and Aloma Avenue provides an improved Level of Service (LOS), which will reduce delay time by 60%, leading to less time sitting at traffic signals.
  • Innovative configuration allows the bridges that carry SR 417 over Aloma Avenue to be widened, rather than completely replaced, which will reduce the amount of new raw materials required.
  • The baseline shift along SR 417 allows for a much safer work zone for both the workforce and traveling public alike.
  • The proposed capacity improvements aim to enhance traffic flow, provide reliable travel times, and bolster overall safety.