text: I've gone to the location in question.
  Firth Road does join up to each other, however splits into two carriageways (as marked separately) which are separated by a line of posts about 1 metre apart, at either end where they would connect up to each other they have concrete blocks stopping traffic. 
  It is not possible for motor vehicles to pass through, it may be possible for motorcycles and bicycles to pass through. Have marked these concrete blocks as a wall as they effectively creates one with a barrier to the highway that foot traffic and bicycles can pass.