Good evening all, (Apologies for grammar and format, typing this on a phone screen) I have a question about UK signalling, more specifically four aspect yellow signals and how drivers react to them. I know it’s not too off topic, but I was hoping somebody who is more knowledgable than I am could shed some light. My understanding goes as far as to what they mean: double yellow - prepare for the next signal to be single yellow, single yellow - prepare for the next signal to be at danger. I read something which would make sense but couldn’t find any actual source. It said they also have speed restrictions attributed to them, ie double yellows - 75 mph, single yellows 45 mph. From the IRL cab rides I have watched I have observed drivers applying brakes when encountering yellow aspects. I was just more curious than anything as to whether this was why or maybe theres’s another more complicated reason? Many thanks!