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合理补贴运输系统，是决定这些系统的投资和运营水准的关键。世界各国不同城市间的运输补贴千变万化，大体上是亚洲最低而澳洲和北美最高。城市运输补贴在深层次上考虑了如何增加收益、外部因素的促进和双方共同定价等经济因素。尽管不同模式之间的需求弹性不高，但是，对于大多数城市，如果不考虑交通拥挤收费的因素，双方共同定价或许是最好的方式。对计算补贴优化的三种模型，作者从它们的数学形式、理论假设、输入和输出变量等方面进行了比较。运用任何一种模型都需要建立需求模型和精确确定成本。经过分析得出其中一个模型是最为实用的，另一个对于研究有用，而第三个在原理诠释方面最佳。
Reasonably subsidizing transport systems is the key to determining the level of investment and operations for these systems. Transportation subsidies vary from one city to another in various countries in the world. They are generally the lowest in Asia and the highest in Australia and North America. Urban transport subsidies at a deeper level to consider how to increase revenue, the promotion of external factors and the two sides co-pricing and other economic factors. Although the demand elasticity between different modes is not high, for most cities, co-pricing by both parties may be the best way to go without regard to congestion pricing. Three models for calculating subsidy optimization are compared by authors from their mathematical forms, theoretical assumptions, input and output variables, and so on. The use of any one model requires the establishment of a demand model and accurate cost determination. After analysis, one of the models is the most practical, the other is useful for research, and the third one is the best in terms of principle interpretation.