If you ever visit our town of Solothurn in Switzerland, before you enter he gate on the East Side, you are confronted with this plan of the city. There is the river Aare that runs through it in the middle. Otherwise the houses and buildings are in their places for many years. Now and again something might be modernised, but otherwise the streets and buildings have been in the same place for a few centuries. Traffic is only allowed in the town for tradesmen and hotel guests. Otherwise it is a town for bicycles and pedestrians. The traffic goes on the roads around the town.