When driving behind a motorcycle or cyclist, why must you allow an even greater following distance than behind a passenger car?

1. Motorcycles can stop much faster and can be destabilized suddenly by potholes, gravel, or gusts of wind
2. A motorcycle is narrow, so there is always room to pass it without changing lanes
3. Two-wheelers accelerate faster than cars, so they will always pull away from you
4. Motorcycles carry less momentum, so a collision with one is unlikely to injure anyone