roadblock

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}, {roadblock}]
    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: {roadblock}, {barricade}]
    

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