I. Stroke-width, form and horizontal spacing of numerals as determinants of the threshold of recognition

Abstract

In general, this study is concerned with improving legibility of traffic signs, giving special attention to motor vehicle license plates: "it can be said that the experiments described in this treatise lead to the construction of 9 different numbers: 1, 2, 3, 4, 5, 6, 7, 8, and 0 (the 9 being equal to the 6 reversed), white on black background for day vision and luminous on a black background for night vision." (PsycInfo Database Record (c) 2025 APA, all rights reserved)