The ideation on the right showcases potential variations for the bicycle handle design. Because our goal is to communicate two distinct types of signals through vibration, it's essential that the handles are capable of vibrating at two different locations.

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Considering the distribution of sensory nerve endings in the hand, we explored vibrating the handles at specific locations that correspond to different sensory areas. The palm of the hand, including the fingertips (depicted in blue), occupies the most space on the bicycle handles. The other sensory areas (depicted in green and pink) are located on the left and right sides of the hand, suggesting potential locations for the second vibration signal on the inside or outside of the hand.

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Through prototyping and testing with our participants, we found that placing the second vibration signal on the outside of the handle not only enhances communication effectiveness but also improves the overall feel and comfort of the handle in the hand. This feedback guided our design refinement to ensure optimal functionality and user experience.