The Dane County Sheriff’s Office reports five people were injured when a tractor-trailer truck rear-ended a commercial bus in a construction zone on Interstate 39-90 Thursday afternoon.  The Lamers bus had 30 passengers when the accident happened at about 1:45 P-M.  All injuries were minor.  Wisconsin State Patrol troopers and emergency medical services personnel were called to the scene on the interstate at mile marker 145.  The left lane on the northbound side was closed to traffic for about two hours.