Constantly think ahead, pre-empt what could/may happen.
Think & say to yourself this mantra "I could die in this vehicle today" (my instructor told me this one!).
Don't wish to blow my own trumpet here but I would say the answers already given are SPOT ON.
Add patience to anticipation as well as judgement. Know the capabilities of the vehicle you are driving and particularly it's dimension.
Ex Class 1 Advanced Driver
Ex Class 1 Advanced Motorcyclist
HGV Class 2
PCV Class 1
Advanced anti- Ambush and Evasion Skills.
Read the prevailing road surface and conditions as well. Can't go far wrong!!!! :-)
I'm an extremely bad passenger, to the point at times I feel sick. My OH though is the only driver I feel safe with...although I still put my foot on the non existent brakes..