Pothole or hazard
in the road
If you are approaching a hazard in the road, for example a pothole, manhole cover or drain cover, outstretch your arm on the side that the upcoming hazard will pass your bike and point to the floor. Wherever possible, this should be accompanied by a circling motion (ie unless there simply isn't time).
Optional call: “Hole! or Holes”
For deep and sharp holes in the road, a clear and loud call of “hole” or “holes” will help notify your fellow cyclists of the severity of the upcoming obstacle. However, this is not to be overused – on UK roads, if we all shouted “hole!” every time the road surface was less than perfect, we’d probably never stop.