Topic: I-95 @ MD 152 Interchange Clayton, MD

Speaker: David A. Greenwood, PE CCM Maryland Transportation Authority (MDTA)/CDM Smith

I-95 ETL Northbound Extension – Reconstruction of the Interchange at I-95 and MD 152

The Maryland Transportation Authority is reconstructing the I-95/MD 152 Interchange as part of the I-95 Express Toll Lanes (ETLs) Northbound Extension. This interchange is one of two interchanges that will be reconstructed as part of the northbound extension of the ETLs. The project includes the widening and reconstruction of I-95 and MD 152. I-95 will be widened and reconstructed to allow for four general-purpose lanes and two ETLs in the northbound direction. MD 152 will be widened to allow for two through lanes and left turn lanes for both the general-purpose lanes (NB and SB) and the ETLs (NB and future SB). The MD 152 bridge over I-95 will be widened and lengthened to accommodate the NB improvements and future SB improvements. The presentation will provide a brief overview of the program and then focus on the reconstruction of both I-95 and MD 152 (highway/bridge) in phases while maintaining all traffic lanes during the peak hour periods. Other work includes the construction of two noise walls and a waterline protection system.

Topic: I-75 @ I-24 Chattanooga, TN

Speakers: Jonathan D. Haycraft, PE, ENV SP Barge Design Solutions & Mike Nadolski, PE C.W. Matthews Contracting 

Interstate 75 Interchange at Interstate 24 – TDOT

The completed Design Build project, valued at over $130 Million, modified the existing Interstate 75 at Interstate 24 Interchange in Chattanooga, Tennessee. The project area includes I-24 from just West of Spring Creek Rd. to the I-24/I-75 Interchange and I-75 from the Tennessee-Georgia state line to mile marker 3 before the East Brainerd Road Interchange. The project area also includes the Tennessee Welcome Center located in the southeastern portion of the project. The project has a total length of interstate of 7.5 miles, as well as 14 new bridges, 20 new retaining walls and nearly 10 acres of wetland permitting impacts. Modifications include widening the interstate where the I-24/I-75 ramps were widened to three (3) lanes and the radii increased to allow for 50 miles per hour (mph) design speed. The project also modified the traffic circulation pattern of the existing Welcome Center by reconfiguring the entrance and exit to eliminate the weaving condition along northbound I-75. Our team was able to win the project by focusing on innovation during the proposal phase and creating a very aggressive schedule compared to the other bidders.

To date, the project has been completed and open to traffic. This presentation will go over the following items:
• Project overview
• Design decisions & coordination
• Accelerated construction schedule (20 Months)
• Original vs. Finished construction photos

Topic: Windy Hill Boulevard Smyrna, GA

Speakers: Chris Rideout, PE, Eric Brisse, PE, Aimee Turner, PE, PTOE Croy Engineering

Windy Hill Boulevard – Smyrna SPLOST

When it comes to roadways, sometimes the best solution is rethinking the design altogether. Incorporating multi-modal travel in a high-capacity roadway that includes local access to both residents and businesses can be a challenge, but that is what happened for the Windy Hill Boulevard project in Smyrna, Georgia. This project is currently under construction and accommodates local traffic, bicycle lanes, pedestrian trails, and express thru-lanes, which increases the mobility of east/west pass through travel. The project also includes two strategically placed bridges allowing local vehicular and pedestrian traffic the ability to traverse the express thru-lanes. These bridge with pedestrian friendly areas, re­connect residents once cut off from the rest of the City. Given the density of the corridor and high volume of daily travel, the project has taken a great deal of coordination with a variety of organizations. From a simple drawing on a napkin all the way to construction, join us as we dissect the Windy Hill Boulevard project and the creativity that went into making it happen.