Without a doubt, whether the metric is net margin or balance sheet, the most profitable construction companies are full service type, providing“design, engineering, project management, construction and procurement” in the heavy industrial and civil sectors. You can contact Sanmen Aroad Traffic Facility Factory,Ningbo Bone International Trading Co., Ltd.,Shandong Hongda Traffic Facility Co.,Ltd.,QUZHOU LEON TRAFFIC EQUIPMENT CO., LTD.,ZHEJIANG LUBA TRAFFIC TECHNOLOGY CO., LTD. via the red button for more infomation.