What happens when a lorry comes towards you?
A very evocative and lovely clip, I assume the road is a one way or closed section? I was worried at every blind left hander in case something came down the road and you were already on the left.
No it is all two way. The road up the pass is wide enough for two vehicles to pass though only just in some places. The last part of the video, before the lake section, is on a different and older road. There are some points at which two vehicles can not pass.
In these sections it is good practice to sound your horn when approaching blind curves. It is not for nothing that an expression for the car horn in Italian translates as "acoustic adviser". Unfortunately this is a habit that is falling out of practice and if people don't lower the window a bit they won't hear anyway. Even in winter, if I am in the tin top, I lower the window enough to hear.
If you meet the bus, or a truck, coming you may have to back up, if it is another car common sense must be used as to who backs up.
You will notice a certain amount of horn blowing from about 14:40 on, mainly on blind curves but also to thank and acknowledge the politeness of two slower drivers who pulled to one side to let me pass. Usually trucks and the local bus use their horns quite a bit.