The bread analogy is a bit daft for one very simple reason; eating bread does not impair one's ability to drive. Drinking alcohol does.
But the majority of the points you raised are entirely right; raising the drinking age will have absolutely zero effect on the drink-drive incidents. The under-21s who want to drink will obtain alcohol from other places and drink it regardless. Evidence from countries that already have high legal drinking ages shows this; with supporting evidence that lowering the age makes alcohol consumption less of a rebellious act, and therefore something that isn't done to impress.
One method of reducing drink drive rates would be to lower the acceptable blood alcohol level down to a level that effectively means you cannot have a drink and drive, rather than the existing system whereby you can have a beer or maybe two, possibly three, before being rendered unfit to drive.
I have no evidence for this, but I imagine that many drink drive convictions are not the recidivist drunk driver types, but plain ordinary Joes who had a couple of drinks after work and thought they were OK to drive home. Doesn't take much mis-calculation to go from being just under the limit and pretty much sober to a bit over the limit and a little bit impaired. Obviously, this change would have to co-incide with an education campaign aimed at re-inforcing the message that one drink = conviction. Increased enforcement during the same period (and possibly in the run up to it) would also pay dividends, especially if enforcement was targetted towards educating people in a positive way.
Take this for example. The law is passed to make any blood / breath alcohol level illegal. The date on which the new rules come into force, say three months from the time the amendment to the Land Transport Act is passed, is heavily advertised on television, radio and in print. In the preceeding thress months, the cops step up their anti-drink drive enforcement campaign. Where drivers are detected with alcohol on their breath, and the evidentiary breath alcohol test shows them to be existing under the limit, they are not prosecuted (obviously; they've done nothing illegal) but are told that as of the date the new rules will come into force, had they been caught in identical circumstances, they'd be prosecuted, face loss of licence, plus increased insurance costs etc. Some leniency may be shown after the date too, so the rule change comes acros not as an excuse for the cops to remove licences and generate revenue, but a safety measure.
There could also be some more measures taken:
- Free shuttle buses back from clubs or entertainment areas, together with free parking for the cars of inebriated drivers.
- Many clubs stamp your hand on entry as a proof of age or entrance check. Have a designated driver stamp, entitling the driver to free drinks, but no alcohol.
- Double rego fees for anyone with a drink driving conviction, which expires five years after the date of the conviction. If no further conviction has been recorded, the excess is refunded.
- Make alcohol awareness courses easier to come by, along with mandatory (and enforced) attendance following a drink drive conviction.
- Jail for recidivist drivers. No home detention. No community service. Jail.
- Make presentation of ID to buy alcohol mandatory no matter the apparent age of the purchaser. Only NZ driving licence and proof of age card acceptable. Should a drink drive conviction (possibly more than just one conviction) be recorded against the person, that information is prominently displayed on the licence / proof of age card and no alcohol can be sold to that person. it won't stop them obtaining alcohol, but it will make it more difficult to obtain.
I'm sure there are more ideas out there too. Essentially the trick is to effect a culture change, as that's the only thing that will lower the drink drive rates, and therefore casualties, in the long term.
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