The extension project began towards the end of 2010 and was opened in April 2015, on budget and 3 months ahead of schedule, after five years of construction works with zero contingencies, fines or environmental penalties, while remaining open for some 250,000 drivers every day. Its growth projections are for up to 400,000 vehicles driving on the roads every day by the year 2020.
The new LBJ Express doubles the driving capacity of the old LBJ. Up to six new toll lanes have been added in the I-635 section, and four on the I-35 section. This extension aims to cover the needs arising through population growth over the next 30 years.
The most important reconstruction section of the I-635 within this project is the provision of two main interchanges (the I-35E and the North Dallas Tollway), 12 major overhead passes, six overhead passes for slip roads and a walkway for pedestrians (the Joe Ratliff Walkway).