1. Low contrast strong enough to support réduction.
2. Vertical stress
3. Large width
4. Big x-height
5. Bracketed slab serifs. They catch on the line and strongly emphasize the end of the stems, which tend to appear rounded on such scales.
6. Oblique stems release white space at the beginning of the curves.
7. Big counters
8. Opened shapes, to release inner white space.