Does "excessive speed" mean greater than 70mph or just greater than the speed limit in place where the accident occurred? Limiting cars to 70mph won't help when people exceed the speed limit in areas where the limit is much lower than that and violators never exceed 70mph.

And how many of those 30,000 deaths were actually caused by vehicles travelling over 70mph?

Was that 'n' in tenticle supposed to be an 's'?