Common ground is the rectangle whose walls solidly protected. The Citadel has 4 main gates. Open the ports that are in the middle of each side, connect the opposite port is two main roads called its Decumanus and Cardo. At the intersection of two main roads to the city centre, including the main square and other public works. usually, in flat terrain, its Decumanus Street axis is the axis of most recent East-West. Shorter, Cardo axis North-South. In the case of steep terrain or coastal, waterfront, long axis parallel to the copper line sets the level of the terrain or parallel to the line of the River, the coast. The short axis is always placed in the direction perpendicular to the long axis. The four remaining in the area are divided into land steadily square box. This way is influenced by principles of planning Hippodammus of Greece. The city steadily usually has a size of 70x70m to 150x150m. On the ground, building or public works. Population density is about 250 to 500 words/ha. Arena private-public works has the largest area-usually built inside or outside the city wall protection.
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