In Massachusetts, USA, red light cameras were illegal until very recently, due to a 70s era law specifying that a live policeman had to issue a citation for something like that. From well before traffic cameras were common.
https://www.iihs.org/research-areas/red-light-running
So let's use that as an upper bound.
How many people were killed by these backups you're talking about?
https://www.cbc.ca/news/canada/toronto/parkside-drive-speed-...