APPENDIX I
(See paragraph 21)
Form and Dimensions of Letters and Numerals to be used on Traffic Signs
The proportions of the letters of the standard alphabet and of the numerals illustrated in diagram 1 of this Appendix are given in the second column of the following schedule.
The proportions of the letters of the “compressed” alphabet and of the: numerals illustrated in diagram 2 of this Appendix are given in the third column of the following schedule.
The numerals to be used in conjunction with each of. the alphabets are identical.
Generally the thickness of the stroke for letters and numerals should be one-sixth of the height of the letter or numeral.
LETTERS
| Letter | Percentage width in relation to height | Remarks | |
| Standard Alphabet |
“Compressed” Alphabet | ||
| A | 90.00 | 80.00 | The upper edge of the horizontal stroke is 37°5 to 40:0 per cent. above the base line. |
| B | 66.66 | 60.00 | The lower portion is slightly larger than the upper. |
| C | 72.50 | 65.00 | Based on letter “O.” The gap is wide and finished with radiating lines. |
| D | 75.00 | 70.00 | Part of letter “O” is used and is linked to the vertical stroke with straight horizontal lines. |
| E | 62.50 | 55.00 | The horizontal strokes differ in length. The upper edge of the intermediate stroke is 60.0 per cent above the base line. |
| F | 57.50 | 52.50 | Part of letter “E.” |
| G | 75.00 | 67.50 | Based on letter “O”. The length of the horizontal stroke is 27°5 per cent. of the height of the letter and its upper edge is 45-0 per cent. above the base line. The vertical stroke terminates on the base line. |
| H | 80.00 | 72.50 | The upper edge of the horizontal stroke is 60.0 per cent above the base line. |
| I | 16.66 | 16.66 | This stroke is used as the basis of the strokes for all other letters. |
| J | 70.00 | 65.00 | The lower portion is part of a circle and is finished with a radiating line. |
| K | 80.00 | 72.50 | The projection from the vertical of the two inclined strokes is similar. |
| L | 62.50 | 55.00 | Part of letter “E.” |
| M | 100.00 | 90.00 | The junction of the intermediate strokes is pointed and finishes 5.0 per cent. above the base line. |
| N | 80.00 | 72.50 | The junctions are of stroke width on the top and base lines. |
| O | 80.00 | 70.00 | The letter is oval in form. |
| P | 65.00 | 60.00 | The lower edge of the curvilinear portion is 40.0 per cent. above the base line. |
| Q | 80.00 | 70.00 | Based on letter “O” with the tail of full stroke width terminating 35.0 per cent. above the base line. |
| R | 72.50 | 67.50 | The upper portion is based on letter “P.” |
| S | 70.00 | 67.50 | This letter is 5.0 per cent. longer than other letters, overlapping equally the normal top and base lines. The lower portion is slightly larger than the upper. |
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