Voiceover “Guess who (man’s name/woman’s name ran into the other day?”
-Head-on collision into another car with two passengers-
“(different man’s name/woman’s name)”
I remember it from among similar PSAs as significant for two features of the Silent Generation: their excellent “sick” comedy (Lenny Bruce, Nichols & May); and how married couples comprised the essential social unit (e.g. “Newhart’s Sam and Janet evening”) of their era.
I think this was from Ireland’s Department of Environment (DOE) or the UK’s THINK! campaign (not sure) but I cannot find a video of the one you are describing. The Irish ones were pretty gruesome (to the point of being banned till late at night so kids couldn’t watch them).
NOTE: The linked video above is upsetting. Watch at your own risk.