Imposing speed restrictions is easy, but forcing motorists to observe them is trickier.限制车速容易，但强制司机遵守这些限速规定就难办多了。Imposing speed restrictions is easy, but forcing motorists to observe them is trickier...限制车速容易，但强制司机遵守这些限速...
Imposing speed restrictions is easy, but forcing motorists to observe them is trickier.限制车速容易，但强制司机遵守这些限速规定就难办多了。This is the general rule, but some cases are trickier than others.以上是一般规则, 但某些案例会比别的案例更为棘手.The lower the nu...