Cycling cities have one point in common: they are characterized by high levels of “filtered permeability” (FP), a principle that still isn’t widely known or studied. In these cities, a cyclist’s freedom of movement is considerably greater than a motorist’s. The objective of this article is to highlight and operationalize this principle for the first time. For this purpose, a FP index has been developed and calculated in 60 cities throughout the world. The results demonstrate that the freedom of movement of a cyclist in a European city is on average 44% greater than a motorist’s, which is a FP level about three times greater than what was measured in the other geographic areas studied (South and Central America, North America, Asia and Oceania). As other well-known factors (e.g. safety, accessibility, traffic calming measures), FP could be an effective dimension to create a conducive urban environment for cycling and thus, promote more sustainable mobility behaviours.

自行车城市有一个共同点：它们的特点是高水平的“过滤渗透率”（FP），这一原则仍未广为人知或研究。在这些城市中，骑自行车者的行动自由远大于驾车者。本文的目的是首次强调并实施这一原则。为此，已在全球 60 个城市开发和计算了 FP 指数。结果表明，欧洲城市骑自行车的人的行动自由度平均比驾车者高 44%，这是所研究的其他地理区域（南美洲和中美洲，北美、亚洲和大洋洲）。作为其他众所周知的因素（例如安全性、可达性、交通平静措施），