Perhaps a bilboard campaign would be more effective if it had animated representations showing each step of the process. No need to show the actual babies, but show it like they have the emergency procedures on airplanes.
And maybe have each billboard only show one or two of the steps in the process, so drivers will catch the next picture or two a couple miles down the road/freeway.
It would be especially effective if it showed a partial-birth abortion with the scissors and the vacuum.
And the last one can say “Burma Shave”!
“No need to show the actual babies?”
Well, I and 49 million dead babies disagree.