二、国外常规环交通行能力的计算公式 (一)国外环交通行能力的主要公式简析英国、美国、苏联都有自己的环交设计公式,现将常见的常规环交通行能力计算公式汇总列于表1。表1所列的(1)～(3)式为英国所提出,且均列入了反映环交几何线形要素的交织段长度,环道宽度,入口宽度,说明这些要素 Second, the calculation of foreign conventional capacity of the Central Bank (A) of the main capacity of the Central Bank of the ability to analyze an analysis of the United Kingdom, the United States, the Soviet Union has its own design of the circular design, now common conventional circular capacity calculation formula summary Listed in Table 1. The equations (1) to (3) in Table 1 are proposed by the UK and include the length of the interlaced section, the width of the loop and the width of the entrance reflecting the geometrical linear elements of the torus, indicating that these elements