Stay aware and let others know about hazards on the road to stay safe.
The roads are not a hazard-free place to ride. Potholes, cattle grids, raised ironwork; all of these can potentially cause issues. This video explains how to deal with them and how to alert other riders to the presence of these hazards.
Other hazards – like horses and oncoming vehicles – are a little more obvious, but you still need to approach with caution and let other riders know what's coming up.