"A"and"B" Streets
A类型和B类型街道
The classification of A and B streets was invented by new urbanists to prioritize thoroughfares that were，or could be transformed into，commendable predestrian experience.The classification is rudimentary but helps identify pedestrian-friendly and auto-oriented thoroughfares
A和B类型街道的分类是由新都市主义者发明，给那些已经是或可能可以转化为行人友好的道路以优先权。这种分类很简单，但有助于识别行人友好和自动导向的道路。
A streets are thoroughfares that provide an excellent pedestrian experience and promote safety，comfort，and convenience for pedestrians.These streets have the characteristics that are good for walking such as buildings and entrances fronting the street，wide sidewalks，crosswalks，street trees，well-designed street lighting，narrow curb-to-curb dimensions，small curb radii，parallel parking on-street，and lower traffic speeds.
A类型街道提供了良好的行人体验，是安全，舒适和便利的通道。这些街道具有适合步行的特点，如街道前面的建筑物和入口，宽阔的人行道，人行横道，街道树木，精心设计的街道照明，狭窄的路缘到路边尺寸，小道路转弯半径，与街道平行的停车位和较低的通车速度。
B streets are thoroughfares that are intended for automobile-related functions such as access to parking lots or garages，loading docks，drive-through businesses，and gas stations.They are less accommodating of pedestrians.Frontage and build-to-line requirements may be less stringent on B streets.
B类型街道是用于与汽车相关功能的通道，例如进入停车场或车库，装卸码头，免下车商业和加油站的通道。他们对行人的接纳度较低。建筑外立面和临街界面的进退要求对B类型街道不太严格。
The diagram on the left illustrates a tartan grid of alternating A and B streets。The A streets have a narrow curb-to-curb dimension，on-street parking，and street trees，whereas the B streets have a wider curb-to-curb dimension，dedicated left turn lanes，and access to alleys。
左边的图表显示了交织的A类和B类街道的网格。A类街道狭窄，路缘到路边的尺寸很小，有路边停车场和街道树；而B类街道路缘到路边的尺寸更宽，有专用的左转车道，以及通往小巷的通道。
The block platting achieves a bias toward A streets by having two-thirds of the lots front the A streets and one-third face the B streets。All lots are accessible from the Alley network.
街区用地三分之二面向A类街道，三分之一面向B类街道实现向A街道倾斜。所有地块都可以从小路网络进入。
Corner lots are usually desirable for retail businesses as they are visible from four directions。Lots at the intersection of A and B streets are optimum for retail businesses that rely on both pedestrian and vehiclar traffic。
对于零售商业来说，街角地块通常是理想的，因为它们可以从四个方向被看到。在A类型和B类型街道交叉口处的地段对于依赖行人和车辆交通的零售商业来说就最好了。
In retrofit situations，A streets may be designated to receive prioritized spending for pedestrian and bicyclist safety，street-tree plantings，and other elements that are desirable on pedestrian-friendly thoroughfares。
在改造情况下，可以设计A类型街道来为行人和骑自行车者的安全，行道树的种植，以及行人友好通道所需的其他元素的获得优先费用。
