What are the important emphases when riding two on a motorcycle?

1. AOne must ensure that the passenger's weight is not greater than the rider's (driver's) weight.
2. BOne must instruct the passenger regarding correctly mounting the motorcycle. Everything else is secondary.
3. COne must set codes for communication between the passenger and the driver. Everything else is trivial (not important).
4. DOne must instruct the passenger before the ride on everything concerning mounting, dismounting, sitting correctly and body behaviour.

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