At present, expressway concession main modes include BOT mode and TOT mode.

目前高速公路特许经营的模式主要有BOT和TOT模式。

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So, analyzing the risk of TOT mode and establishing a corresponding precautionary system has the theoretic and practical benefits.

对TOT模式中风险进行分析并建立相应的风险防范体系，不仅具有理论意义，更具有实践意义。

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So, analyzing the risk of TOT mode and establishing a corresponding precautionary system has the theoretic and practical benefits.

对TOT模式中风险进行分析并建立相应的风险防范体系，不仅具有理论意义，更具有实践意义。

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