It extended almost 2,000 kilometers and was forty paces wide, with roads running parallel to the waterway on either side. ... Tang Rulers maintained an extensive communications based on roads, horses,and quite sometimes human runners. ... Economic Increased food supplies encouraged the growth of cities causing urbanization throughout the capital of Southern Song Dynasty, thatha more than 1 million residents. they supported hundreds of restaurants,noodle shops, taverns, teahouses, brothels, music halls,theaters, club houses, gardens, markets, craft shops, and specialty stores dealing in silk, ...