Safe and Langhorne are two words usually not found in the same sentence unless the word "not" also appears, however from what I remember and from pictures and old film I've seen, there was a run off area between the track and the inside spectators, with a pretty deep drop off that I guess was there to kind of catch any cars that spun/flipped down to the inside. The picture above doesn't really make that apparent.
The picture below is from before I started going, but you can kind of see what I mean.
Photo by Jeff Neff - Provided to The Vault to us by Jeff Neff
Speaking of "safety", check out all the spectators on the gray billboard or whatever it is in the upper right of the photo.