Why at some airports planes land on railway moving or the brisk highway of the city

Modern people very long time ago got used to railway crossings which meet on automobile highways, but to see the train in the middle of the main runway at the airport – absolutely not clearly. And there is more to come strangenesses which can be met on our planet. It appears, airliners, coming in the land or take-off, several times per day can stop the brisk highway which has been eternally loaded by a stream of cars...