The document discusses three types of urban street plans: 1) Irregular plans which have winding streets without a clear organization and are seen in old parts of cities. 2) Grid plans which use a simple perpendicular grid pattern based on Greek/Roman cities and were common in 19th century European expansions. They are easy to extend but can require diagonal roads for traffic flow. 3) Radio-centric plans organize streets in concentric circles around a central point, seen in cities like Paris and Madrid. They allow quick access to the center but traveling between outer areas requires passing through congested centers unless connecting roads are built.