Haptic speedometer using linear characteristics

Drivers have to change their sightline to focus on the vehicle's visual speedometer to check the speed at which they are travelling. This may be a dangerous loss of concentration. A head-up display was developed to solve this issue. HUD has several issues. Large amounts of visual information can create visual clutter and degrade the driver's information processing due to cognitive overload. The HUD rivets their attention, diverting it from other sources. Driving safely and comfortably, we propose a new type of speedometer that lets drivers know their speed using vibro-tactile sense. The speedometer gives vibration feedback to drivers by its intensity, duration and position switching speed. Those three factors are modified linearly depending on the driving speed. Analysis demonstrates the proposed haptic speedometer helps drivers know the speed information precisely and intuitively.