Ideally the toilet should have a black tank to capture the urine or waste water.. cannot be flushed out to the road. That would be a health hazard and the vehicle can be seized if found of illegal discharge of sewage.
Congratulations brother n may the Lord Jesus Christ Elohim God the father and the Son snd the Holy Spirit protect you n the staff n the vehicle (bus). May His Almighty hand be upon the driver, 🙏🏿🙏🏿🙏🏿