| • GRADE: 7+
| • TOPICS: civil engineering, roadway design, transportation safety
| • MATH: central angle (also: circumference, ratios and proportions, units conversion)
| • SCIENCE: curvilinear motion, centripetal force

The image at 05:55 (File:DBAG Baureihe 612 Neigebetrieb (612-009-1).jpg) is the courtesy of A. Gutwein. Distributed under CC BY-SA 3.0.