The spacing from the lower edge of the top border to the nearest line of copy should be approximately equal to, but in no case less than, one-half the average of the letter or numeral height in the first line of copy (Figure 4‑46).

The spacing from the upper edge of the bottom border to the nearest line of copy should be approximately equal to the average of the letter or numeral height in the last line of copy. If the last line copy contains a mileage numeral, the bottom border spacing should be between the upper edge of the bottom border and the lower edge of the common line of text (Figure 4‑47).

If an arrow is the only element in the last line, spacing between the lowest point of the arrow and the upper edge of the bottom border must be the same as the spacing at the top of the sign (Figure 4‑48).

The lateral spacing to the vertical borders must be the same as the height of the largest letter used on the sign. The lateral spacing must be applied to the longest line of copy, and each of the remaining lines of copy must be centered within the sign borders (Figure 4 49).