当道路并道时，应遵循什么规则?What rule should be followed when merging lanes?
让1辆⻋汇入后再走Let one vehicle merge before proceeding
将时速降至40公里Reduce speed to 40 km/h
加速以拉开后⻋距离Accelerate to increase distance from the vehicle behind
让2辆⻋汇入后再走Let two vehicles merge before proceeding