This from Martin Nowak:

Friday night around 7:20-7:30 I saw Ambulance 3R from Roberts Park with Bridgeview Engine Company 405 using 425 at the scene of a 2-car accident that had moved into a CVS parking lot at 87th and Harlem (Later you can see 3R transporting.) Engine 405’s crew got a call to respond as seen in the video. As they were responding they called in the 2nd accident or both. The 2nd one was in front of the Shell gas station (4-5 car accident) and the third was a 3-car accident. In the video you see a red car at the gas station entrance, a witness told me the third accident where most of my recording took place was caused by the driver of that car. Not sure who caused what, but it was a busy night for MABAS 21. About 5 people were transported. Anyone that has any other information or has questions please do so in the comments. Here are a few pictures plus a video showing crews arriving. Thank you.
multiple crashes in Bridgeview

Martin Nowak photo

multiple crashes in Bridgeview

Martin Nowak photo

multiple crashes in Bridgeview

Martin Nowak photo