Actually, one of the biggest factors in the reduction in the death count, is changes in what happens immediately after the crash. Wide availability of cellphones , and air ambulances , together with technical improvements in critcal injury care have greaty incresed the number of people who survive after serious injury.
Whereas once, after a crash, the injured person would wait, dying, while someone went and found a landline phone, then wait while an ambulance made its way there, then the trip to the nearest hospital, which like as not didn't have anything flash in critical care facilities. It all took too long when people were really badly hurt. Now, the first person along probably has a cellphone, and helicopters can get there much quicker than an ambulance stuck in the traffic jam. And take the injured person directly to a major hospital.
Those that know speak of the "golden hour". The hour immediately after major trauma, if the injured person can be gotten to critical care facilities within that hour , their chances of surviving increase enormously. Now, far more crash victims are getting there within that hour.
Hence, I think, what we see - more hospitalisations, but fewer deaths.
The drop in the death rate isn't due to road law - it's due to better ambo and communication services and more advanced nursing and medical treatment.
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