Abstract
The search for a missing person in a recent criminal case raised the question whether it is possible to reconstruct car-driven routes effectively by using data taken from a digital tachograph. Tachographs are mandatory in many vehicles across multiple countries. However, the recorded data comprises only speed measurements, without recorded GNSS-based tracks. Additionally, EU regulations limit the amount of GNSS-based locations recorded by smart tachographs. This article describes a semi-automated approach for reconstructing car-driven routes based on speed measurements. The method employs a linear reference system for locating speed measurements along route candidates for visual evaluation. This technique was successfully applied to find the corpse of the missing person. Therefore, revealing routes is an option that jeopardises drivers' privacy, increasing the risk of misuse.