Possible Clues:

• Thus the black snake may stop on the road
• Dark natural pitch
• On which one might drive and sleep outside during a stop?
• Will that black snake stop over the road?
• Creeper to proceed lamely on road
• Petroleum by-product
• Will the snake stop all over the road?
• Mixture of tar and gravel used in road surfaces
• Pitch surface
• Will the snake not go on over the road?