Reference down 啥意思?

问题描述：

Reference down 啥意思?
Referencing down in urban areas
Next in the sequence,you should reference down.To reference
down in an urban area,move your eyes down from the look up
position so that you view the road 12 seconds ahead at city
speeds.
这是一个驾车的动作，我猜也许是：“拉开跟随距离”