rat run
noun [ C ] UK uk/ˈræt ˌrʌn/ us/ˈræt ˌrʌn/
（司机为避开大路上的交通拥堵而走的）小路，小街
a small road that is used by a lot of drivers who are trying to avoid traffic on larger roads
The road through our village has become a rat run for commuters trying to avoid delays on the A14. 驾车上下班的人们为了避开 A14 大道的交通阻塞，纷纷穿过我们村的这条小路绕行。