Street introduction: Pompeii covers an area of about 1.9 square kilometers and is surrounded by a stone wall of more than 4,800 meters long. There are two straight and flat streets from south to north and from east to west, dividing the city into There are 9 urban districts, each with many streets and alleys connected vertically and horizontally. The street is 10 meters wide and paved with large stone slabs. The ancient Roman carriages were very developed. The carriages of warriors and nobles always galloped in the middle of the road, leaving deep ruts on the road in the middle of the street. At all intersections, there are raised "stone-separating carts" about 30 centimeters high. When the speeding carriage approaches the intersection, it will naturally slow down and allow the wheels to drive slowly through the gaps between the stones. It is similar to the "speed bumps" and "zebra crossings" on the road today.