There will always be situations where (human or computer) captors aren’t sufficient. You can add more sensors or blame the existing one. Until that, a typical driver adapt its velocity depending on his capabilities and the road/weather. In my country that also partially enforced by the driving code: freeway is limited to 130km/h but reduced to 110km/h if it’s raining or 50km/h if visibility is less than 50m.
Adding more sensors will let you increase your speed but if you want safety, look for your speed.