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Obviously it would not display the probability as a number, but rather beep and/or glow red or something when it crossed a threshold.
Since probabilities would vary a lot more than your course was unpredictable, it would sometimes be able to warn you eerily far ahead of time. If it was good enough, there would be times when it would go off as soon as you got in your car.
Surprised some one hasn’t done this; great idea!
What about 2 or more vehicules interacting? Can you predict what other predictors will predict?
and ideally not just the beep but also why — “road conditions due to weather” “your speed + stop and go traffic”
I know where to get the data. Invest in my company and we'll build it.
Beware the collides of March 
I can totally see this incorporated into the car itself. Daimlers already have auto brakes; this is an extension of that idea, using historical and live data, both from public sources and from the driver. It's brilliant.
Mexico City version: uses data from @LaAgenciaCDMX to warn you when you are entering a dangerous neighborhood 
Jane was late for the meeting but as soon as she got into her car, the car said “sorry Jane, the risk of any trip at the moment is over the allowed threshold”. She tried to convince HAL to start but the AI wouldn’t bulge. Minutes later HAL turned the car on.
South Korea recently implemented something like this for pedestrians approaching dangerous intersections (high incidence of smartphone related pedestrian automotive accidents) - escalating alerts culminating with smartphone push notification:https://www.cnet.com/roadshow/news/south-korea-smartphone-traffic-safety-lights-lasers/ …
v1 really should just be "Beep when I am approaching a stretch of road that has XX% higher crashes than other areas in proximity". Since crashes should be mappable but your speed, time of day, etc. would be relative to you and less so the other crashes.
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