The picture is taken from your car. You became stressed by the silver car and chose to move out onto the hard shoulder to make it easier for the silver car to overtake you. Was this allowed?
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Visibility is good and the road is wide. The risks with temporarily driving out on the hard shoulder are very small. The fact that there is oncoming traffic does not stop you from driving out on the hard shoulder; you are not responsible for what other cars do.
Furthermore, it is generally permitted to overtake where there is oncoming traffic if you do not drive into the lane of the oncoming traffic (which is something the silver car appears not to need to do, thanks to you).
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