CSX A-Line) and State Road 527 (Orange Avenue southbound and Magnolia Avenue northbound) before meeting State Road 15(Mills Avenue), where US 17/92 turns north thereby marking the eastern end of US 17/92(SR 600) concurrency. Between Maguire Boulevard and Lake Barton, SR 50 runs along the northern border of Orlando Executive Airport, however the view of the airport is obstructed by numerous stores and shopping malls. Along this stretch, the road passes north of Colonial Plaza and south of Orlando Fashion Square. Across from Lake Barton is the western terminus of Old Cheney Highway, a former section of SR 50. East of this intersection is Little Lake Barton, and SR 50 begins to curve to the northeast, but not as sharply as the former segment. Lake Barton stretches from the vicinity of this intersection to the southwest corner of State Road 436 (Semoran Boulevard), which has had an interchange since 2010. The road continues its northeast curve into Azalea Park as it passes by the nearby Colonial High School named in honor of SR 50, it then intersects Old Cheney Highway a second time but then moves directly east again before the intersection with State Road 551(Goldenrod Road) East of Orlando and the Space Coast Though leaving Orlando, SR 50 remains in Orange County as it enters Union Park, Here the road has one interchange with State Road 417(Central Florida GreeneWay) at Exit 34, but signs also point towards State Toll Road 408. Entering University Park, SR 50 intersects such major highways as State Road 434 (Alafaya Trail), and then the eastern terminus of State Road 408 at Exit 23, which is also the southern terminus of the Challenger Parkway at the University of Central Florida. After crossing a bridge over the Econlockhatchee River, the road curves to the southeast and passes through Lockwood and then Bithlo which is near the Orange County Raceway complex, which includes the Orlando Speed World Dragstrip and the Orange Speed World Speedway. Further east within Bithlo, SR 50 serves as the western terminus of State Road 520 at an interchange with no exit numbers. East of this interchange the road turns direct east again and passes through Christmas, a rural community containing various Christmas shops, trailer parks and the Jungle Adventures Nature Animal Park which boasts of having "Swampy" the world's largest alligator. Before crossing the St. Johns River, SR 50 runs along the northern