Type, Process
Why we set every number in tabular figures
Timetables, prices, dashboards: when digits line up, people read them faster and trust them more.
Most typefaces ship with proportional figures by default: a 1 is narrower than an 8, which looks lovely in a sentence and terrible in a column. On the Seeline departure boards, proportional figures made 11:11 and 18:48 different widths, so the eye had to hunt for the minutes.
We now switch on tabular figures for anything a reader will compare: times, prices, balances, statistics. In CSS it is a single line, font-variant-numeric: tabular-nums, and most good typefaces support it.
The exception is large display numbers, where the uneven spacing of tabular 1s becomes visible. There we set proportional figures and kern by hand.