Brooksdie, Belle Valley and Emergycare responded to I-90 for a vehicle accident -- car under a semi.  On arrival crews reported 2 separate accidents 1 with a patient moderate injuries and the other a vehicle was under a semi.  The vehicle under the semi was on fire which extended to the semi.  Crew faced a heavy fire load due to the contents of the trailer.  Kuhl Hose, Harborcreek, Perry Hiway and Lawrence Park were requested for tenders and engine companies to help contain the fire.  Crews were on the scene for several hours.  Fire Police assisted PSP until after 0300 on the 29th.