We seem to live in a world where "technology" is the solution to all of our problems. Too bad. Everyone seems to want the instant solution, and in a defeatist sort of way goes about implementing the WRONG solution to a multitude of problems.
For example: The solution here? Driver Training. Speeding doesn't kill, it's irresponsibility. it's inability. A Bad Driver decides do do 90 through a school zone and kills someone - and "speeding" is to blame? No: It's an irresponsible idiot who thinks it's appropriate to drive at excessive speed in risk-sensitive areas. It's an irresponsible idiot without the SKILLS to drive at those speeds even where the road and conditions could possibly allow it.
I have seen, daily, drivers who don't exceed the limit that are more dangerous than the fastest drivers. Distracted, disinterested, and while licensed not qualified to drive a vehicle. Is there technology to save us from THESE people? Um... yes... how about lowering the 'standards' for dangerous driving (so that that asshole that was shaving as he changed lanes into me yesterday would be properly charged with reckless) and then trhowing the book at them. If you want to throw some high tech at the problem- how implementing technology (proper black box / telemetry recorders) to support the conviction of these drivers.
It's not how fast you go, it's what you do with the fast.