[1] : WordNet (r) 2.0

roadblock
     n 1: any condition that makes it difficult to make progress or to
          achieve an objective; "intolerance is a barrier to
          understanding" syn: barrier
     2: a barrier set up by police to stop traffic on a street or
        road in order to catch a fugitive or inspect traffic etc.
        syn: barricade
see also:
barrier barricade 

[2] : Moby Thesaurus II by Grady Ward, 1.0

54 moby thesaurus words for "roadblock":
   arch dam, backstop, bamboo curtain, bank, bar, barrage, barricade,
   barrier, bear-trap dam, beaver dam, blank wall, block, blockade,
   boom, breakwater, breastwork, brick wall, buffer, bulkhead,
   bulwark, cofferdam, dam, defense, dike, ditch, earthwork,
   embankment, fence, gate, gravity dam, groin, hydraulic-fill dam,
   iron curtain, jam, jetty, leaping weir, levee, logjam, milldam,
   moat, mole, mound, parapet, portcullis, rampart, rock-fill dam,
   seawall, shutter dam, stone wall, stop, wall, weir, wicket dam,
   work

Roadblock >> R Words
Roadblock, definition of term: Roadblock
roadblock_pag1.html