Ready for review (at least at a high level, it was completed before chnsh was finished reviewing).
chnhb would about double the total length need to be reviewed, and with lower data quality, I prefer to not tackle at this time. Most of chnjjj is newer, with better OSM metadata and enough dashcam videos.
chnjjj mostly focuses on a grid network between BJ and TJ, which requires cutting through HE.
