Thinking about it I'm not sure if 'zero tolerance' means you must have a zero blood-alcohol reading. There could be an acceptable blood-alcohol level (like in other countries as namabiru pointed out) and they have 'zero tolerance' for anyone over that limit, i.e. though wont let anyone off if caught. Would be interesting to find out.

Better safe than sorry though.

I agree that speeding, while dangerous, probably isn't the worse thing on the roads. It's the tail-gaiting, swerving through traffic, middle-lane driving, poor lane discipline at roundabouts, not looking when joining from slip-roads, not indicating, parking on the road, so on and so forth, that are dangerous. Of course, when done at high speed these things become even more dangerous and more likely to cause worse injuries.

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