A hit and run crash on I-84 in Danbury is being investigated by State Police.  Troopers responded to the westbound side of the highway Sunday around 9pm, near the exit 8 on-ramp.  A Honda traveling in the left lane reportedly sideswiped a vehicle in the right lane, causing damage.  The Honda spun out of control, went off the roadway and crashed into a metal beam guide rail in the median.  State Police say the driver got out of the wrecked car, into a blue Infinity, and fled the scene.  The two people in the car that was sideswiped were uninjured.  The disabled vehicle was registered to a Hartford man.  Anyone who has information on the hit-and-run is urged to call Trooper Bret Pikul at 203-267-2200.