Caption: 
This image shows 10 automated loops around a slalom course using the 2015 R&D 100 award-winning Ranger technology. With Ranger, vehicle position (in green) varied by less than 5 centimeters, compared to GPS measurements (in yellow), which varied by as much as 2 meters. Southwest Research Institute developed and patented Ranger to provided precise position and orientation measurements for automated vehicles using a ground-facing camera and localization algorithms.