A "side vehicle" is:

1. AA device for carrying a person or a load, mounted on a wheel and attached to a motorcycle on its side (a sidecar).
2. BA motorcycle on which three wheels are mounted one behind the other.
3. CA vehicle travelling alongside another vehicle whose speed is identical to the speed of the other vehicle.
4. DA vehicle attached to the side of another vehicle by a bar whose length does not exceed two and a half metres.

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