Charter bus riders should not be allowed on the bus until _________.

Charter bus riders should not be allowed on the bus until departure time. There are several reasons for this:
- Safety: It is important to ensure that all passengers are properly seated and secured before the bus begins to move. This helps to prevent injuries in the event of an accident.
- Security: Allowing riders on the bus too early could increase the risk of theft or vandalism.
- Efficiency: If riders are allowed on the bus early, they may start to take up seats or leave their belongings in the aisles, making it difficult for the driver to load the bus quickly and efficiently.
- Comfort: Riders who are on the bus early may become hot, uncomfortable, or restless. This can make the trip less enjoyable for everyone.