E-scooter riders are particularly vulnerable regarding car drivers. Therefore, this study aims to investigate the potential of contrasting colors to make e-scooter riders more visible to car drivers during daylight. Two visibility aids were designed: Patterned Jacket (including jacket and backpack composed of alternation of yellow and black squares) and Wheels-Backpack (including yellow stripes on black e-scooter wheels and yellow triangles on black panels of the dark backpack). Volunteers were invited to detect e-scooter riders from images while completing a secondary task. They detected riders wearing the Wheels-Backpack significantly sooner than riders wearing the Patterned Jacket or those without any visibility aid. Moreover, their visual strategies were more effective while detecting riders from the Wheels-Backpack condition. The Patterned Jacket did not show any significant improvement of riders’ conspicuity relative to the Control. However, participants judged that both aids provided e-scooter riders the same visibility benefits. It seems that merely adding contrasting colors in visibility aids might not always make e-scooter riders more visible to drivers. Instead, the distribution of contrasting colors across the key points of the e-scooter and the rider could be a better technique.