(March 14, 2016, 12:01 PM EDT) -- RAPID CITY, S.D. — A motorcycle safety instructor may testify on the dynamics and physics of motorcycle collisions, a South Dakota federal judge ruled March 9 (Theodore J. Vore v. Clifford L. Osborn, No. 13-5075, D. S.D.; 2016 U.S. Dist. LEXIS 30009)....