这个标识代表什么意思?What does this sign mean?

这个标识代表什么意思?What does this sign mean?
路面上有散落的小石子,低速行驶The road ahead may have loose stones - drive slowly
前方路面可能会爆胎The road ahead may puncture your tyre
前方的植物枝条可能会碰撞你的挡风玻璃There's a median strip of vegetation that may hit your windscreen

砂石路面,溅起来的石子会把风挡玻璃打出裂纹,所以要慢速前进