The image below, of Sydney's M2 freeway at Barclay Road, shows the two directions of a median busway crossing over each other so that buses can stop on a center platform -- without the buses needing to have doors on both sides.
Another I'm familiar with is on the Los Angeles Harbor Transitway at I-105. The station is buried under a freeway interchange but the crossovers on the north-south busway are clearly visible.
Can anyone identify other examples of this design in busways anywhere in the world? Please reply in comments if so. Thanks!