it is estimated that over ___________% of all crashes in the u.s. are caused by driver distraction.

The best answer is 50%. Approximately over 50% of all failures in the U. S result from the distracted drivers. Really on young drivers to get easily distracted by other items rather than focusing on driving.

Reference:

As a result of inherently dangerous nature of auto racing, many individuals, which includes drivers, crew members, representatives and spectators, have been mortally wounded in crashes related to the activity, in races, in getting qualified, in practice or in individual testing sessions. Deaths between racers and spectators had been numerous in the early years of bike racing. However advances in safety technology, and specifications designed by sanctioning bodies to limit rates, have reduced deaths nowadays. Spectacular accidents have quite often spurred increased safety measures and perhaps rules changes. Widely regarded as being the worst accident amidst them is the 1955 wreck at Le Mans that killed driver Pierre Levegh and approximately 80 crowd with over 100 staying injured in total.

This is a list alphabetically sorted, and structured after the kind of competition, of the more notable individuals, excluding motorcycle riders. Additionally , several famous racing individuals have been killed in public highway crashes;

External links:
https://en.wikipedia.org/wiki/Driver_deaths_in_motorsport