buildings, and temporary parking and delivery vehicles. As this complexity greatly increases the risk of accidents, an ideal street will have low speed limits, enforced by traffic calming features such as narrow lanes.

Conversely, Mahron describes roads as a "high-speed connection between two places". To mitigate traffic and reduce the risk of accidents, an ideal road will have limited entrances and exits, no parking, and strict segregation of vehicular and pedestrian traffic. They also have