中国城市经过改革开放30多年的发展，特别是自上世纪90年代后期至今，在机动化快速发展的推动下，城市的规模、开发模式、用地构成、交通运行状态、交通设施与交通组织都发生了天翻地覆的变化。作为城市交通组织核心的城市道路系统，也随着城市的快速发展在组织功能、设施等级、道路系统与土地利用关系等方面发生了很大的变化。主要体现在以下几个方面：
Driven by rapid motorization, fundamental transformation has been taken place in Chinese urban scale, development mode, land use composition, traffic operating conditions, traffic facilities and traffic organization in the past three decades of reform and opening-up, particularly from the late 1990’s till now. Urban road system, as the core of urban traffic organization, also varies significantly amid the rapid urban development in terms of organization function, facility class, relationship between road system and land use, which are mainly manifested by the following facts:

大城市中心城区职能变化，导致中心城的交通活动特征变化。服务业快速发展，原先的工业用地被改造为城市的服务业新区，承担起城市新兴的服务职能，城市活动、城市交通的目的、分布、运输特征也随之而变，相应地对城市道路设施的要求也发生改变。
Changes of central city area functions in large cities lead to variation of traffic activity characteristics of the central city area. With the rapid development of service industry, former industrial land are transformed into new urban service area and undertake new service functions of a city, so objectives, distribution, transportation characteristics of urban activity and urban transportation change, and requirements on urban road facilities vary accordingly.
城市规模扩大、开发模式和城市功能分布发生变化，要求交通指标的差异化。城市道路需要按照分区进行组织，对交通设施的要求也差异显著，要求针对特定开发地区交通特征进行相应的交通组织和设施规划，
Urban scale enlargement, changes of development mode and urban functions distribution call for varied traffic indexes. The requirement of organizing urban road as per zoning leads to various demands for traffic facilities, so corresponding traffic organization and facility planning is needed to be carried out based on specific development area.
快速交通系统发展导致网络结构变化。城市交通系统中快速道路、轨道交通作为城市交通组织的骨干，交通组织的方式发生变化，影响到规划的道路级配、密度与规模。
Development of rapid transit system lead to changing network structure. Urban expressway and rail transit in urban transportation system serve as backbone of urban traffic organization, and changing way of traffic organization has implications for planned road grade proportion, density and scale.
交通机动化发展迅速，交通拥堵严重，环境要求日益提高。城市规划已经不可能仅仅按照交通畅通来确定道路设施的规模，必须转为通过设施和交通政策的配合保障城市的有效运行。因而道路系统规模确定的原则、目标和服务水平指标也将发生较大的变化。
Rapid development of motorized traffic brings the problem of severe traffic congestion, which poses ever increasing requirements to environmental protection. Smooth traffic is no longer the only criteria in determining the scale of road facility in urban planning; instead, facility and traffic policy should be coordinated to guarantee effective operation of a city. Therefore, scale determination principle, objectives and service level of road system will also undergo great changes.

译员：Joanna（品格资深综合类英语翻译）

本文由北京翻译公司品格翻译提供，未经允许，不得转载。