Humanist typefaces are the best choice for legibility, as they have:
Open shapes
Generous spacing
Varying proportion
Unambiguous forms
"An important factor in the recognition of Latin characters is their openness — the distance between the terminations, or stroke endings. The open design of a humanist font makes for highly visible, distinctive letterforms that avoid blending into one another. You can see the difference when you compare the variety of terminations in the letter ‘c’, from square grotesque typefaces like Eurostile, to the more humanist typefaces like Frutiger. Large counters (the white space in letters like ‘o’, ‘b’ and ‘a’) and x-heights (the height of lower-case letters compared to upper-case) also help generate more open shapes that are easier to distinguish at a glance."
The paper "An Evaluation of Typeface Design in a Text-Rich Automotive User Interface" explored this in even more detail.
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