Why Is This Semi Truck Launching Itself Airborne?

Talk about being in the right spot at the right time. What would you do if you saw THIS happen in front of you?

This accident happened in Indiana recently along I-74. The dashboard camera records a semi jumping the overpass.  The 30 year old driver was trying to avoid a car that was swerving in his lane so he veered hard right to avoid a collision.  At full speed he came up the side of the hill, went airborne over the interchange, and landed on the other side.

The driver and his seven year old son weren't hurt so the owner of the video had a little fun with different music tracks of what it would have been like in a movie scene.