State legislatures delegate to cities and towns the power to promulgate ordinances or by-laws in limited areas of law, including zoning, rent control, schools, traffic, and parking.

州立法机构授予城市和城镇在法律的限定领域颁布法令和细则的权力，这些法律限定领域包括分区、租金控制、学校、交通和停车等。

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In this paper, the dynamic zoning model of elevator traffic was clearly outlined, and the artificial immune algorithm for the dynamic zoning model was designed.

剖析了电梯交通的动态分区模型，设计了动态分区模型的人工免疫算法，并对之做了比较仿真研究。

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Some of the variables that affect traffic volume are zoning laws, construction of new shopping malls, and the availability of public transportation.

NPR: Bumper to Bumper: Predicting Traffic Flow