Switch routes are a favorite of mine. Traditionally seen in the Run ‘n Shoot offense, the switch concept at its core is just as it sounds - two receivers essentially switch places of their routes. The inside receiver runs a wheel route underneath the outside receiver, while the outside receiver stems inside for 5 yards and then goes upfield. The infinitely-talented and much smarter than me Chris B. Brown has a good summation on his site, SmartFootball. Here’s a sample route using the switch concept:
The read for the quarterback on a switch concept play is first to the wheel route then to the inside route.