Driving on expressways is far detached from most regular streets. For instance, expressways permit a higher flow of traffic to pass through them, and at higher speeds. Meanwhile, streets are usually tiny and have relatively low speed limits. After all, streets are flanked by sidewalks, buildings, trees, and other parts of an urban landscape. Expressways are large, sometimes up to 8 lanes wide. Accessing a common expressway is also comparatively though, and managed only through specific on-ramps and off-ramps. Furthermore, expressways don't welcome pedestrians, motorbikes, or slow vehicles.