That key might be provided free for trial or personal use, and it can be associated with layered subscription pricing models for commercial use or to access advanced content and functionality.
此密钥可以免费试用或供个人使用，也可以将其与分层订阅定价模型关联来供商业使用或访问高级内容和功能。
A six-month pilot trial in Eindhoven last year showed that 70 percent of users changed their behavior as a result of pricing, by traveling either at off-peak hours or on less crowded roadways.
2009年，埃因霍温6个月的试行结果表明，该收费方式改变了70%驾车员的习惯，他们避开高峰期出行，或者选择不拥堵的路段。
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