Close to 20 people were injured this morning after a bus tipped over on Highway 151 near Waupun. The Dodge County Sheriff’s Todd Nehls says a passenger called in reporting a bus carrying Special Olympians on their way back to Appleton had left the road, took out a guard rail, before the bus rolled over and came to rest on its side. Nehls says emergency personnel have taken passenger to area hospital for treatment of injuries that range from minor to moderate. As of 6 a.m. authorities were routing traffic off at the Highway 49 off-ramp and right back on at the Highway 49 on-ramp. An investigation into why the bus left the road is ongoing.