When parking a lorry on the road in this situation, are you obliged to switch on the position lights or parking lights?

In accordance with the provisions of the Road Traffic Act, when a vehicle is stationary in conditions of insufficient visibility, the driver is required to switch on the sidelights or parking lights. The situation in the picture takes place at night, on an unlit road, therefore it is necessary to switch on the appropriate lights to ensure the parked vehicle is visible to other road users.