@itnomad @ai6yr @MisterMadge It’s likely the Radar Cross Section (RCS) that counts most towards being detected by the vehicle’s systems. Have questions about how the driver would be alerted when the bike/rider is detected ahead. Like the idea of helping vehicles better “see” bike riders. Beginning to think that a pool noodle covered along the rear side with HVAC metallic tape might be a easy/low-cost everyday solution. Cheap and easily replaced while enlarging rider keep away space.