obstacle, hurdle, stumbling block, impediment, checkpoint, bottleneck, hindrance, barrier, barricade, traffic jam, logjam, snag, crossroad, gauntlet, constraint, challenge, pitfall, speeding, blockades, signpost, convoy, hitches, flashpoint, quandary, headache, hiccup, stoplight, minefield, setback, milestone, tollbooth, conundrum, monkey wrench, gridlock, highway, thicket, problem, outpost, tollgate, intersection, litmus test, spanner, vehicle, hinderance, bulldozer, road, milepost, gantlet, cordon, dilemma, difficulties, distraction, stalling, guardhouse, hot potato, obstructions, thoroughfare, hassles, avenue, motorist, driver, breakthrough, impasse, jeep, drawback, chokepoint, disincentive, delays, complication, fence, ditch, billboard, disadvantage, hault, deadline, stopgap, boulders, motorcyclist, toll plaza, policeman, restriction, trash heap, shortcoming, scooterist, requirement, underbrush, rubicon, turnoff, glitch, kink, overpass, prerequisite, firebreak, explosive device, stalemate, cliff, gate, deadend, berm, wrench, path, thorn, roadblocks, obstacles, difficulty, downside, handicap, hurdles, flaw, impediments, casualty, caveat

ideological barrier, language barrier

barrier, obstacle, obstruction

barricade, barrier