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When exiting from the West Gate freeway (80kph) in Melbourne onto the King'sway exit (80 kph) the car's speed and the cruise control displayed speed reduce from 80 kph to 70 kph. The speed limit is 80 kph and the signs by the side of the road show 80 kph. The 2020.40.3 update has not affected this. Any ideas as to why the car's speed reduces and how to fix it?