premise: A motorcyclist stops at an empty crosswalk, while thirty or forty motorcycles and bicycles sit parked in the street beside him. hypothesis: a person waits atop a motorcycle.
entailment: A motorcyclist is a person. Since that person is stopped at a crosswalk, they must be waiting for their turn to move. A motorcyclist stopping implies they are riding their motorcycle, which means they are sitting atop a motorcycle.