Would it not be way more useful if the NTSB focused on road design? As someone from Europe I oftentimes see very wide roads in the USA with a maximum speed of 15 mph or something, their design does not stop one from driving 50+ mph, however. In Europe, you often see that if there's a lower maximum speed, the width of the road is reduced, and obstacles are placed to ensure you actually can't drive significantly faster than allowed.

Also, smaller streets will typically lead to less distracted drivers, because it requires a certain level of concentration to navigate these streets.

Oh, and something about enormous SUV's that won't make traffic any safer...