In a field study of the readability of traffic signs using different type fonts, a researcher measured the distance at which professional drivers were able to read each of four different signs during daylight and nighttime driving; two of the signs used the existing font and two used a new font designed for greater visibility. In this experiment, the independent variable(s) is/are

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The independent variables in this experiment are the type of font and the time of day, as these are the conditions manipulated by the researcher to observe their effect on the dependent variable, which is the distance from which each sign could be read by the drivers.

In a Field Study of the Readability of Traffic Signs