[matthewowen]

Broken line is pretty common for partial/variable service.

For example, here it is on a philly trolley map: https://www.septa.org/maps/trolley/city.html

And you can also see the same sort of thing on this BART map: https://www.bart.gov/system-map

[supernova87a]

I agree, but I think there's something odd about the way he's put the segments in his map. Maybe the divisions need to be bigger breaks or something.