Here is the " kilometer zero" from which all the country's radial roads start.
这里是全国所有放射状公路的起点“零公里”。
英语百科
Arterial road
An arterial road or arterial thoroughfare is a high-capacity urban road. The primary function of an arterial road is to deliver traffic from collector roads to freeways or expressways, and between urban centres at the highest level of service possible. As such, many arteries are limited-access roads, or feature restrictions on private access.