Dave Buck, spokesman for Maryland State Highway Administration (MSHA), says trucks went out overnight to pretreat for possible precipitation Saturday. They transported four people for checkups. A spokesperson for Montgomery County Fire and Rescue says between 4:30 and 6:30 a.m. the department responded to 8 collisions on the Beltway between Connecticut Ave. and Rockville Pike. He says one truck was operated by a contractor and loaded with both salt brine and liquid magnesium. The truck treated the west side of the Beltway between 11 p.m. and 1 a.m. This is the area where the accidents occurred. MSHA has the truck and is investigating why it was used and how it was loaded with the wrong materials. Buck says Maryland State Police were kept busy Friday morning with accidents on the Beltway near Georgia Ave. WUSA Images: Beltway Crashes MSHA has salted and conditions are improving.