I actually had a dream supprisingly similar to this the other night. >.>
Except in my dream it was an out of control semi hitting a gas station, we seen it swerve down the embankment just as we started turning twards it. All we could do is try to outrun the shockwave as we entered the parking lot.
I'm assuming it didn't work too well, as the last words I heard before I woke up was my sister screaming "oh my god, my foot!"
But I digress, what a creepy feeling.