Doing draconian things that are ineffective has an opportunity cost that requires diverting time and effort from doing things that actually make a difference. Data on traffic cameras improving safety is mixed (mainly because of people flooring their brakes to avoid fines only to cause themselves to be rear ended). It also does not help that a number of places actually try to cause motorists to run red lights when traffic cameras are put into place by decreasing the amount of time used for yellow lights so that they can increase revenue. Interestingly, increasing the time spent with the light yellow decreases collisions at intersections and unlike traffic cameras, always has a positive improvement on collisions. Another option would be to eliminate intersections by adopting cloverleaf and/or diamond interchanges, which not only make traffic flows more efficient, but also improve safety (since you cannot run a red light, or have a collision caused by someone suddenly stopping upon seeing a yellow light). As for speed limiters, they are outright dangerous when they restrict people to speeds well below the 85th percentile.
That said, NYS has done a number of things to improve driver safety. They probably do not do as much as they would in less densely populated areas, but it is not hard to imagine other U.S. states adopting them. The real problem is that there are so many cars on the road that the average distances between them are very small. As long as the distance between vehicles remains non-zero, collisions are avoided. Efforts really should be focused on maximizing the distance between vehicles, rather than on minimizing the speed at which they travel. Raising the speed limits to the 85th percentile would help there. Car pooling lanes would also help. Modernizing public transport so that people do not need as many cars would also help.