减速慢行的英文是“decelerate and proceed with caution.”来源：减速慢行是一种交通安全法规，用于降低车辆的速度，以便能够在道路上更安全地行驶。

例句：

Please decelerate and proceed with caution on this winding road. 请在这条蜿蜒的路上减速慢行。

We were told to decelerate and proceed with caution when approaching the construction zone. 我们被告知，在接近施工区时要减速慢行。

Drivers should always decelerate and proceed with caution when visibility is poor. 司机在能见度差时应始终减速慢行。