What Functions Should Urban Roads Have?

[VanColin]

The following details the functions that urban roads should have: 1. Expressways: These are the main traffic arteries connecting the major parts of a city, forming the backbone of urban roads, with their primary function being transportation. Traffic on expressways should ensure a certain driving speed, so lanes of corresponding width should be set up based on traffic volume to allow smooth vehicle movement. 2. Secondary roads: These are the main roads within a region, serving both general traffic and service functions. They work in conjunction with expressways to form the main road network, providing extensive connections between various parts of the city and facilitating traffic distribution. Typically, both fast and slow vehicles share these roads. 3. Branch roads: These serve as connecting lines between secondary roads and residential areas, catering to local traffic and also aiding in traffic distribution. They may have sidewalks and commercial buildings on either side.