I can only speak for Ontario, but around here people still discuss and measure heights and weights in feet and pounds. Everything else is metric. But I suppose since drivers licenses are official documents they figured they should go with proper metric units.Really? That's odd. I've always found Canada to be a weird hybrid of metric and imperial. Height and weight are always imperial, unlike, say Australia where it's all metric.
What's more, this being Canada, they wanted it in centimeters.
I just have no reference point for how tall someone is when they're 170cm.
Metric heights/weights don't work for me either. I have to convert them in order for them to really have meaning. I think in metric for everything else though, especially speeds and distances.