Since charging by weight is executed on expressways, truck drivers takes illegal behaviors such as "bouncing scale" and driving in "s" route, etc. in order to reduce weight.

高速公路实施计重收费，货车司机为了减少重量采取“跳秤”、走“ S ”型等违规行为。

youdao

Drivers are being warned to obey weight restrictions on a road bridge or face the prospect of it being entirely shut while improvements are carried out.

BBC: Bigsweir Bridge