Once (at least).
I was on a bike tour with a bud. We just crossed a drawbridge before it closed to auto traffic to let a boat pass. We got a couple miles down the road before the bridge swung back and unleashed the hell-spawned fury of fifty SUVs and pickup trucks pulling Boston Whalers straight from the garage of Satan himself.
The opposing lane of traffic on this two-lane road was bumper to bumper as the traffic roared up behind us at 60mph. I was in the lead and could not see past my bud with my helmet mounted rear-view mirror. At some point he yelled "DITCH!", so I bailed. Not sure if it was truly called for leaving the paved surface, but my bud has nerves of steel and if he says ditch - I ditch no questions asked.
No one was hurt. We took a water break until the traffic passed and resumed our day on the road.