无论是建设公路通道还是铁路通道，跨海通道都具有良好的投资回报率。如果建设公路、铁路通道，建成以后，通过车辆收费和各种管线收费等，每年利税即可达200亿元以上，若加上土地增值、旅游开发、节约燃油与材料等综合社会效益则成倍增加。跨海公铁通道约2600多亿元的投资，12年左右即可收回成本。
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