After a double-decker Megabus flipped over outside of Indianapolis early Tuesday morning, at least 18 passengers have been taken to nearby hospitals for treatment, according to NBC Chicago. Thirty-five additional passengers were taken to hospitals but almost immediately released, NBC Chicago reported. According to Coach USA North America, the line's parent company, the bus crashed at around 4:30 a.m. while traveling on a route beginning in Atlanta and ending in Chicago, NBC Chicago reported. The Indiana State Police reported that the accident stemmed from the driver of the Megabus attempting to swerve to avoid an accident on the road that occurred approximately 10 minutes earlier, according to NBC Chicago. The roadway was also reported already in a slick condition stemming from overnight rain that continued into the early morning, according to ABC 7 Chicago. An emergency respondent alleged that a median barrier prevented more serious injuries, as it prevented the bus from leaving the northbound lane and entering oncoming southbound traffic, according to NBC Chicago.