Copy is Key
Letters that are too close to each other can reduce legibility, even with a clean typeface. Crowding can confuse the intention of the copy causing certain letter to visually attach to one another. The problem with reading letters that are tightly spaced is greatened when the copy is not viewed straight on, but rather at an angle. This is always a possibility with any type of outdoor advertising. Condensed typefaces can begin to resemble picket fences.
Stacking lines of copy also reduces readability. Our eyes move smoothly and quickly over a message that takes a single line of copy. If stacking is needed for the purpose of your ad’s layout, pay close consideration to line spacing. If the copy on your ad does not have proper line spacing the descenders and ascenders (letters such as t, b, q, y, etc.) can create confusion for those viewing your ad.