Front/side impact warning unavailable light. although it did not happen in my vehicle it can cause the car to slow even at high rates of speed.
I was driving in the fast lane on the freeway, and for no apparent reason, the car shut down, then immediately started up again. i was fearful that i was going to get hit from behind, so immediately went to the slow lane. i drove the car to and from my destination with no further incident, but fear it might happen again.