Inappropriate traffic speeds are a major cause of traffic fatalities. The use of lighting and visual information such as signage could assist in encouraging appropriate driving speeds. Along sharp roadway curves, an overall reduction in driving speed might be desirable to prevent rollover crashes. At other locations, such as those prone to chronic congestion, uniformity of vehicle speeds might be desirable in order to optimize safety and traffic flow. A method of modifying the size and spacing of traditional chevron signs along curves was tested to convey the perception of increased curve sharpness.