In the beginning it looks easy, but the higher the level the more difficult it becomes. Not only crossings and junctions but also ramps, bridges, subways, railroads, a.s.o. make it not easy to do your job as highway engineer. The roads are of different width. Every building has to be connected with the road network. Click a piece and it will change it's location with the one, which is framed. Only if you have used all pieces and it is guaranteed, that no road will end in the green or in the countyside or in the wet, a.s.o. you can start the engine of your car and make a trip.