Thanks for the quick replies! Adding more thoughts below.
Thanks for the clarification there. I've left mine with defaults at the moment, but I have some observations on that:
a) Underground routes are less opaque than overground routes, which I think is probably not as helpful as just using the same opacity everywhere such that opacity will always mean the same thing. See example below for what I mean - the route on the bridge is a bus with 197 Cims using it vs the translucent line through the water which is a subway with 492 Cims.
b) Route popularity isn't really coming through for me with the current method of using opacity. If it's getting to 100% opaque once a few Cims are using that route (if that's what you're saying?) then it would appear that non-similar routes will be equally popular. I could be misunderstanding but one thing that comes to mind is to collect all the routes, determine the min and max # of Cims using each route, then set opacity according to proportion for each route. For example, if you have 3 people going on one route and 3000 people going on another, set opacity to 1% for the 3 person route and 100% for the 3000 person route, with other values within that scale. That way you always have meaningful delineations among routes. Of course this means that a single-family house would have a 100% opacity line over the route that that single person takes, but I think that is what would make sense anyway.
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Sorry if I misunderstood again but is there a way to turn on/off everything using just mouse clicks? I didn't see an option to toggle it on in the overlay so I've just been using shift-e. Anyway yeah I personally would find it more clear if something in that overlay were toggling on and off with the use of whichever hot keys have functionality (and so people can toggle on/off with their mouse rather than remembering hot keys).
Ahh, great points. Maybe it's not worth the extra effort and performance hits then.
I completely misunderstood what the colors meant. I thought that since it was using the same colors as the residential/commercial/office, the lines were related to those destinations or something. Your explanation makes a ton of sense then (maybe if you get time, add this color code in the mod page and/or in-game overlay, if it's not already there somewhere). I still think my note about #1b above would help with the original confusion I had though regarding route popularity. It's just hard to tell whether a many-unit building for example has people mostly walking to their destination or taking a car when the opacity seems high even for just a few people using it. Here's an example where the only vehicle appears to be the postal van and the green line is nearly opaque, even when compared to the pedestrian traffic to the right which has something like 15 more people using it.
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Anyway thanks for listening to my suggestions and for helping me understand how to use the mod as it is. This is super helpful!!