Two people were seriously hurt when their motorcycle crashed in the westbound lanes of H-1 freeway near the Hickam offramp just before 6 p.m. Sunday. A 43-year-old man and 39-year-old woman were taken to a trauma center in serious condition, but their conditions improved. The two were not wearing helmets.  Police closed the westbound lanes of the H-1 near the airport viaduct for almost two hours while they investigated.