A motorcycle is not as wide as a car:

Question

Despite their small size, motorcycles still need a full lane width to operate safely. Lane sharing is generally prohibited.

Accepted Answer

But still needs a full lane width to operate safely.

Answer

And can share a lane with a car for short distances.

Answer

And is required to share a lane with a car if traffic is congested.

Answer

And can ride on the shoulder if the traffic lanes are crowded.