Hello alancn,
I hope you are doing well. I wanted to reach out regarding the Route 5 Highway in Sumatra. I am noticing gaps between highway features that are part of the route number. For instance, there is one that goes to the edge of Lampung (https://www.openstreetmap.org/way/53550629, https://www.openstreetmap.org/way/49606420). The same goes from Bukittinggi to Panti (https://www.openstreetmap.org/way/326402774, https://www.openstreetmap.org/way/197955965) and the ref stops at the edge of Aceh Province (https://www.openstreetmap.org/way/678517173). There is reason to believe the ref tagging can be extended between the northern and southern side of Sumatra, filling gaps in the trunk network. I am less certain however about how the ref tagging can be applied in the city of Bukittinggi (https://www.openstreetmap.org/node/2930523147, https://www.openstreetmap.org/node/7624955058). I am curious whether there are resources available to support completing the Route 5 Highway in OSM, and whether this would be worth investigating. I look forward to hearing your thoughts on this.

-ChromeLotus