Text and Typography on Directional Signs
A directional sign is a piece of typography people read at twenty paces, in changing light, often in motion. The font, weight, and spacing decisions are not cosmetic — they're functional. A small mistake on a printed page is uncomfortable; the same mistake on a fingerpost plate makes the sign unreadable from the path it's meant to direct.
This article walks through the typography decisions Tervika exposes — cap height, font family, weight, tracking, and the formatting of distances — and explains how to set each one for legibility rather than for looks.
Cap height, not font size
Most software measures type in font size (points or pixels), which is a bookkeeping number that doesn't directly correspond to anything you can measure on a finished plate. Two fonts at the same point size can have visibly different actual letter heights — sometimes by a factor of two.
Tervika measures in cap height: the height of capital letters from baseline to top, in millimeters or inches. This is the number that matters for legibility. If you set the cap height to 30 mm, the capitals on the finished plate will be 30 mm tall, regardless of the font.
A useful rule of thumb for outdoor directional signs:
| Viewing distance | Minimum cap height | |---|---| | 5 m (close, garden sign) | 12 mm | | 10 m (driveway, trailhead) | 25 mm | | 25 m (across a clearing) | 60 mm | | 50 m (across a field) | 120 mm |
These are minimums for recognising the text. For comfortable reading without squinting, double the values. Tervika's defaults assume close-range viewing — they're sized for someone standing at the post, not for someone driving past at a distance. Bump them up if your sign needs to be readable from further away.
Weight: thicker is not necessarily more readable
The instinct on a sign is to make the text as bold as possible. Bold reads from further away — but only up to a point. A 600-weight (extra-bold) font on a small plate has so much ink that the counters of "e", "a", and "o" close up and read as solid blobs.
The right weight depends on the cap height and the cutting method.
- Engraved or pocket-cut wood plates: Regular (400) or Medium (500) reads cleaner than Bold. The depth of the cut already supplies contrast; adding extra stroke weight just makes the engraving harder for the bit and softens the inside corners.
- Painted or printed plates: Bold (700) or Black (900) reads from further away because painted strokes are flat and the eye needs more contrast. The classic road-sign weight is between 600 and 700.
- V-carved plates: The carving itself adds visual weight to the strokes, so a Regular weight V-carves to look like a Bold pocket-engrave. Use Regular and let the toolpath do the work.
On Tervika's bundled fonts, "Regular" is genuinely Regular weight — not a "book" or "demi" weight masquerading as Regular. If you've changed font and the text suddenly looks heavier or lighter, check the weight setting.
Tracking: the space between letters
Tracking — the horizontal space between letters — is the second-most-impactful typography decision after cap height. Two specific cases matter.
Wide tracking on small plates. When the cap height is small and the plate is short, the eye merges adjacent letters. Increasing the tracking by 5-10% opens up the letterforms and dramatically improves readability without changing the font.
Tight tracking is rarely right. Some commercial fonts ship with tight default tracking that looks elegant on a poster but becomes illegible at distance. If you're using a font you imported, check the default tracking and loosen it slightly (positive tracking values) if the text looks "huddled."
Tervika applies a small amount of positive tracking by default for sign legibility. You don't usually need to adjust this, but you can override it per plate.
Font family: what to pick and what to avoid
The fonts that survive a sign-making context tend to share a few characteristics:
- Open counters. The interior of "a", "e", "o", "g" should be wide. Closed counters disappear at distance.
- Even stroke weight. Highly contrasted (modern serif) fonts — where the verticals are heavy and the horizontals are hairlines — fail at engravings smaller than a fingernail. Slabs and humanist sans-serifs hold up better.
- Distinctive uppercase shapes. Capitals should be hard to confuse: I/l, 0/O, S/5. A font where these pairs are nearly identical is a font that produces unreadable signs.
- No tight inside features. Glyphs with tight internal corners (like the inner well of "e" in some condensed fonts) can't be V-carved or pocket-engraved cleanly; the bit averages them away.
The bundled Tervika fonts are picked with these properties in mind. Open Sans, Roboto, Lato, Montserrat, and Barlow all engrave well at typical sign sizes; Oswald and Raleway work but need more weight; Liberation Sans is the conservative default for unfamiliar materials.
Avoid for sign work:
- Script fonts. Beautiful as decoration; impossible to read from a path.
- Display fonts with unusual proportions. They might work for a single short word but fail for distances and place names.
- Free fonts of unverified origin. Many have hinting issues, broken glyphs, or licensing problems.
Distance and unit formatting
A common mistake on home-built signs is to display distances at full GPS precision: "Stockholm 1,247.93 km." The decimals are meaningless to the reader, they take space the plate doesn't have, and they look fussy. The right number depends on the distance:
| Distance | Recommended format | |---|---| | Under 1 km | "750 m" or "0.75 km" | | 1-100 km | "37 km" (no decimal) | | 100-1000 km | "470 km" (no decimal) | | Over 1000 km | "1,250 km" or "8,400 km" (no decimal) |
For miles, the same logic applies — round to whole miles for anything over a mile, and use feet for very short distances. For nautical miles, the same; nautical miles are mostly used on coastal and marine signs.
Place the unit after the number with a non-breaking space: "37 km", not "37km" or "km 37". Tervika handles this formatting automatically based on your distance unit setting.
A more philosophical question: do you write "37 km" or just "37"? On road signs, the unit is usually omitted because every plate on the same sign uses the same unit. On fingerpost signs that mix nearby and faraway destinations, the unit clarifies that "37" means 37 km, not 37 m or 37 mi. The Tervika defaults include the unit; turn it off only if every plate on the sign is in the same unit.
Combining text, arrows, bearings, and route numbers
A plate carries up to four things: the destination name, a directional arrow (implicit in the plate shape), a bearing or distance, and sometimes a route number or icon.
Two layout principles:
The destination dominates. The destination name is the largest and most prominent element. The bearing and distance are secondary; the route number or icon is tertiary. If the secondary information competes with the destination, the plate is harder to read.
Pair only what helps. A plate showing "London 1,460 km" with a bearing "247°" is more information than most readers want. The bearing is interesting on the side view of the sign as a whole, not as a per-plate annotation. Tervika's defaults show distance prominently and reserve the bearing for the technical preview, not the production plate.
If you do want to show both, place the distance and bearing on the same line in a smaller cap height, separated by a thin space: "London 1,460 km 247°". Don't stack them on separate lines unless the plate is unusually tall — vertical stacking compresses the destination text.
Vertical placement
Tervika exposes a "vertical adjustment" for the text within each plate, allowing you to nudge the text up or down from center. Two situations where this matters:
- Plates with arrow tips. On a plate with a sharp tip pointing right, the text reads better when nudged slightly toward the wide (left) end of the plate, not centered geometrically. Centered text on a triangular plate looks like it's drifting toward the tip.
- Plates with mounting hardware. If you've added mounting holes or fasteners that intrude on the plate face, the text may need to shift slightly to avoid them visually.
A small adjustment — 5-10% of the plate height — is usually enough. Larger adjustments make the text look mispositioned.
What good typography looks like on a finished plate
The goal is text that is readable from the intended viewing distance, in the intended light, at the intended angle. The tests are simple:
- Stand at the planned viewing distance and read the plate.
- Look at it in evening light, not just workshop light.
- Look at it from off-angle, not just head-on.
- Look at the plate that's furthest down the post — the one most likely to be hardest to read.
If any of those tests fail, adjust cap height first, weight second, font third. Most legibility problems are size problems wearing a costume.
A directional sign isn't a poster. The typography lives outside, mediates between the design and the reader, and survives weather. The decisions you make in the editor matter exactly as much as the decisions the saw makes — which is to say, they matter for as long as the sign exists.