(Northampton, MA) – Traffic is flowing again after Monday night’s five-car accident on I-91. It happened around 6 p.m. in the southbound lanes near the Mount Tom coal plant in Holyoke. Luckily, no one was seriously hurt, but traffic was backed up for miles. One woman was taken to the hospital as a precaution. Police say the highway was already busy with people returning from their three-day holiday. The cause of the crash is under investigation.