A hit and run accident on I-84 is under investigation.  State Police say a light-colored SUV merged into the right lane, sideswiping a Honda Civic near the eastbound Exit 5 Sunday, shortly before 2pm.  The Honda swerved and hit the metal beam guide rail and a center median concrete barrier.  The SUV kept going.  The other driver was uninjured, but his vehicle had to be towed.  Anyone with information is asked to contact State Police.