Road diet refers to a reduction in the number of travel lanes available on a road, usually by converting one or more existing travel lanes into turn lanes, bike lanes, or street parking.

“道路瘦身”是指道路上可用车道数量减少，通常是将现有的一个或多条车道变成转弯车道、自行车道或路边停车道。

在道路规划方面，欧美都经验丰富，几年前便已引入这种理念。

The U.S. Department of Transportation (DOT) announced an 18-month campaign to improve road safety across the country. One of the things DOT plans to do is create a guide to "road diets" that it will distribute to communities and local governments. 

美国交通部公布了一项历时18个月，旨在改善全美道路安全的活动。美国交通部计划要做的其中一件事就是制作一本“道路瘦身”指南，并将其分发给各个社区和地方政府。