Banning any alcohol at all would be an easy way to know if you are over the limit or not !
But Ixion is correct in his assesment that the current limit is a safe limit. In years gone by the LTSA have looked at this and been unable to find a relationship between driving with < 80mg and increased accident risk.
It would be banning something that is not a problem. So it would not help the road toll.
Don't forget that we have a certain number of vehicles crash with sober drivers in safe cars travelling at the speed limit.
Saying that alcohol is a factor in a crash is actually not a meaningful or helpful statistic unless you know how many miles are driven by drunk drivers relative to sober drivers.
For example - I am over the drink drive limit and you make a mistake and crash into me. This goes down as an alcohol related accident. So, the statistics tend to double if you are looking for a particular outcome.
For another example, I've noticed that 99.999995% of drivers involved in accidents last year were wearing underpants. Perhaps we should ban underpants ?
The reality is that if 8 out of 100 drivers are drunk, then you would expect 8 out of 100 accidents to involve at least one drunk driver.
Its only important if 8 out of 100 drivers are drunk, but they then become involved in more crashes than they statistically should.
To put it another way, lowering the drink drive limit is like putting an extra bolt in a wheel that wasn't going to fall off anyway.
Getting the REALLY DRUNK drivers off the road is critical. But harrassing safe drivers wont help anything.
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