Sentence:  Guessing the number of jolts which they received in the 72 miles which were studded with <WSD>waterbreaks</WSD>, ruts and gullies would have been a more appropriate mental exercise for the contestants in the Delaware Automobile Association of Wilmington's sealed time or "guessability" run on Saturday, 25th inst. 
Meaning of the word marked with <WSD> tags:  A pothole or similar break in a road's surface caused by rainwater washing away the surface of the road.