On I-35E between Dallas and Denton, when it was recently redone, FM 407 and Corinth Pkwy were changed from over to under. At FM 407, it made more sense for it to be on the lower level, because that would allow for a normal interchange vs the oddball design that was there before. At Corinth Pkwy, changing Corinth Pkwy to be on the lower level allowed the frontage roads to be straight instead of bowing out like they did before, and also avoided having a steep hill east of the crossing to get down to the level of the DCTA RR crossing. Historical Note: When I-35E was constructed, the MKT RR was still active, but Corinth Pkwy did not yet exist. The MKT was taken out of service in 1977, and pulled around 1992. Corith Pkwy was built in recent times, before the DCTA line was built on the former MKT grade. When the DCTA lien was constructed, a pedestrian tunnel for the rail trail on the former MKT grade was removed, and Corinth Pkwy was brought down to ground level to accommodate DCTA. This created a somewhat steep hill on Corinth Pkwy E of I-35E.