[Blue Jays]

"...multi-vehicle pile-up..."

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Once all that metal, glass, plastic, and rubber is sliding all over the place...it is difficult to know where the safest place might be. Exiting your own stopped car puts you at risk, yet getting slammed by a speeding 18-wheeler is equally distressing. Tough call.

[Blue Jays]

I concur with your earlier post about it is likely safer to remain buckled-in with the inherent safety of the car providing protection. If somehow outside the vehicle for whatever reason it would likely be best to continue walking/running forward to get the maximum number of vehicles behind you. Certainly a frightening predicament.