The SPED trip designation is added to settings.


Users need to check Allow SPED Trips in Settings - General:


Scroll down and click 


To make the SPED checkbox show up under Trip properties:

Once a trip is checked as SPED. It will only show up for SPED students in Find My Bus, Auto Assign, and Students bus schedule search:



When adding a student to a SPED Trip using the function below, only SPED students will show up:

You still can add any student to SPED trips using the "+1" icon and the "Manually Add Schedules" function.