At an intersection with one lane in your direction, which action by the vehicle ahead prevents you from passing it on the left?

路口同方向只有一条车道，前车出现下列哪种行驶意图时，你不得从其左侧通过？

阅读相关知识

Passing at intersections is not always prohibited, but a single-lane left-side pass requires the right vehicle status, enough room and safety.

路口并非在所有情形下都禁止超车。单车道内从左侧通过须满足前车状态、空间和安全等条件；前车示意左转时不可这样做。