Welcome to the
Alternatives Update

Study Overview

The Tampa Hillsborough Expressway Authority (THEA) is conducting a Project Development and Environment (PD&E) Study along the south segment of the Selmon Expressway in Tampa, Florida. We’re looking at potential improvements for safety, capacity and community enhancements. Join us in this study!

Learn more about the study from our video series:


Why Are Improvements Needed?

The South Selmon PD&E Study is exploring options to improve the expressway to reduce congestion while improving safety and better connecting communities and destinations within the Tampa Bay Region. The Purpose & Need of the study is explained below under each of the three topics.

Reduce Congestion

In the last ten years, traffic on the Selmon Expressway has almost doubled. The southern section of the expressway is currently at capacity. Future traffic models and predicted 38% population growth (700,000 new residents by 2045) show that traffic will continue to grow and therefore congestion will get worse.

How many lanes are needed in the future?

When are 6 lanes needed? When are 8 lanes needed?

Connect Communities

The Selmon Expressway provides a daily commuter link between downtown Tampa and several densely populated areas and regional attractors. The expressway serves as an important alternative to I-275 during road closures, hurricane evacuations, and regional travel in Tampa Bay.

View Regional Context Map

Improve Safety

Within the PD&E Study limits, this southern section of the Selmon Expressway has numerous on and off ramps with short acceleration and deceleration lanes. This creates safety conflict points and bottlenecks where drivers are merging and weaving to get on and off the Expressway.

View Safety Concerns Map

What Is Our Process?

The PD&E Study process includes several steps to develop, screen, and refine alternatives for additional evaluation. Click through each of the four steps below to see our process and a summary of the alternatives that were developed. You will see which alternatives have already been eliminated during our process and which are still under consideration. Public input is needed now to help the study team determine which alternative will move forward for a more detailed evaluation in the next step of the process. A no-build alternative is considered throughout this process for comparison purposes.

Five preliminary alternatives were developed based on the purpose and need for the project and with an understanding of the existing conditions and constraints along the corridor. The alternatives were developed to limit the need to expand out of the existing right-of-way and impact adjacent neighborhoods and CSX railroad while maintaining the same access at existing ramp locations.

alt 1
alt 2
alt 3
alt 4
alt 5

Click on the images below to see the conditions, considerations, and constraints that went into the development of the five preliminary build alternatives.

What Alternatives Are Under Consideration?

To help you better understand the build alternatives currently under consideration (Alternatives 2 and 6), please use the interactive map below to explore the key features, typical section graphics, 3D illustrations, detailed birds-eye view plans, and noise wall locations.

Click on one of the alternatives to activate the map.

+- Legend

3D Illustrations: Click to view 3D renderings

Potential Wall Locations:

Barrier Mounted Noise Walls on Shoulder
(14ft per the noise analysis)

Ground Mounted Noise Walls at Right-of-Way
(16-22ft per the noise analysis)

Barrier Mounted Noise Wall on Retaining Walls or bridge
(8ft per the noise analysis)

Additional commitment by THEA Sound/Safety Walls

+- Alternative 2

8 lanes (adds 2 lanes in each direction, inside and outside widening)

Linear Feet of Noise Walls
1,428 LF per noise analysis

Estimated Total Cost: $211M

Birds-eye View Plans

Typical Sections

+- Alternative 6

Interim - 6 lanes (adds 1 lane in each direction on the outside)
Ultimate (2033) - 8 lanes (adds another lane in each direction on the inside)

Linear Feet of Noise Walls
2,284 LF per noise analysis

Additional commitment by THEA Sound/Safety Walls
43,163 LF

Estimated Total Cost: $244M
Interim: $179M
Ultimate (2033): Additional $65M

Birds-eye View Plans
(Graphics depict interim)

Typical Sections

How Are We Evaluating Alternatives?

The two build alternatives were compared with the no-build alternative using a set of evaluation criteria to understand environmental impacts, costs and engineering considerations. Also, each alternative was evaluated to ensure that it aligned with the study’s Purpose & Need developed at the beginning of the study.

Evaluation matrix

Resources and Reports

  • Preliminary Engineering Report - Coming soon!
  • Project Environmental Impact Report - Coming soon!
  • Project Traffic Analysis Report - Coming soon!
  • Pond Siting Report - Coming soon!
  • Structures Analysis Report - Coming soon!
  • Comments and Coordination Report - Coming soon!

Your Feedback is Important!

Please complete our comment form or send us an email with your input on the alternatives under consideration. We look forward to your feedback and continued participation!


Communications Department
Tampa Hillsborough Expressway Authority
1104 East Twiggs Street
Suite 300
Tampa, FL 33602

Comment Form

Please provide a comment below and let us know your thoughts on the alternatives under consideration. We encourage you to view all update information presented prior to commenting.