[albumen]

I've been driving in Ireland for 30 years and I've never heard anyone number lanes. For me it's left/slow; middle; or right/fast lane.

[closewith]

When I did my B license test probably about 30 years ago, the Rules of the Road all referenced inside/outside lanes. When I did my CE license last year, it had been updated to only use lanes 1, 2, 3 etc.

Obviously fast and slow are just colloquial terms.