The section from I-20 to Downtown Dallas will be undergoing a major reconstruction by 2015 to 12 lanes. Reconstruction of I-35E and the downtown Mixmaster interchange with I-30 is planned as part of the Horseshoe project, derived from the larger Pegasus Project. From this point, I-35E is named the Stemmons Freeway to Lewisville. This section will undergo reconstruction in three phases. The first, a widening of I-35E from I-635 to Denton, will start in late 2011 to over 16 lanes. The second, the LBJ Project, will include elevated toll I-35E lanes by 2016. Last is the major reconstruction of Stemmons Freeway (I-35E) from downtown Dallas to I-635 to over 20 lanes by 2020. Interstate 35E replaced most of US 77 between Hillsboro and Denton. US 77 is unsigned along the route, with the exception of the highway that runs through Waxahachie–Red Oak and Denton. I-35E was completed in the early 1960s. When first designated, I-35W & I-35E were the only "suffixed" highways in Texas. Subsequently, I-69W, I-69E, and I-69C have been designated.