List of highways numbered 51

The following highways are numbered 51: == Australia == Kamilaroi Highway Plenty Road == Cambodia == National Road 51 (Cambodia) == Canada == Alberta Highway 51 (defunct) Saskatchewan Highway 51 == Cuba == Caimito–Salado Road (2–51) == Finland == Finnish national road 51 == France == A51 autoroute == Greece == EO51 road == Hungary == M51 expressway (Hungary) == India == National Highway 51 (India) == Iran == Zobahan Freeway Road 51 == Italy == Autostrada A51 == Japan == Japan National Route 51 == South Korea == National Route 51 == Lebanon == 51M Coastal Highway == New Zealand == New Zealand State Highway 51 == Philippines == N51 highway (Philippines) == South Africa == R51 == Turkey == O-51, a motorway in Turkey running from Adana to Mersin.

Source: Wikipedia — List of highways numbered 51 (CC BY-SA 4.0)