Possible Clues:

• It paves the way
• How one of 14 down may stop on the surface of the street
• Dark substance used in road surfaces
• Snake to stop on the road
• Stop when confronted by snake on the road
• Might the snake stop on the road?
• When parking, come to a stop, doing for road surface
• Pitch surface
• Concrete jungle stuff
• What you see on roads, eg signs for Car Park and Stop