The tag description for road-trips states:

Road trips are long journeys by car.

Should this be rephrased to include motorbikes? Motorbikes use the same roads as cars, so I'm not sure why road trips would be only by car.

Although we can also make road trips by bicycle, kick scooter, skateboard, roller skates or horse-drawn carriage, those may use different roads than cars or motorbikes, so it would make sense to treat them differently.