Here is a counterintuitive but (I believe) true thing: you would have been better off just parking your car and not driving it again until tomorrow. I figured this out when I had a forward collision warning (plus hard braking event) that brought my daily score down to 31 (!) for that one day. The reason for this is that your daily score's contribution to your overall score is weighted by number of kilometres driven, but -- and this is the crucial part -- the FCW percentage is capped at a max of 63.3.
So your 50 km of perfect driving, by increasing the number of kilometres you drove today, increased today's weight in the overall total score. The same 50 perfect kilometres tomorrow would have added weight to a day when you have a 100 score; instead, they added weight to your current day, which is probably sitting at 94 if you had no other adverse scoring events.
The reason the 63.3 cap is important is that you only get the benefit of that cap if you drive very little on that day. To take my example, on my 31 score day, I drove 8 km and had one FCW, which works out to an FCW score of 125 per 1,000 km. Since it was capped at 63.3, it had less than half the impact that it "deserved" in the formula. By scoring 100 on many more kilometers the next day, I reduced the damage to my overall score.
The lesson here is that if you have a bad day, but its badness is limited by the caps build into the formula (see the
FAQ for the caps applicable to each factor), it seems that you are better off just parking your car for the day and adding good kilometres tomorrow rather than trying to fix it today.
All that said, I'm sitting in Toronto at 99 on 1,715 km and getting very tired of thinking about this stuff.