Hi, when adding the change:lanes, it would be recommended to split the existing way to maintain the routes.

https://tools.geofabrik.de/osmi/?view=pubtrans_routes&lon=-117.30466&lat=33.09804&zoom=17&baselayer=Geofabrik%20Standard&opacity=0.51&overlays=ptv2_routes_valid%2Cptv2_routes_invalid%2Cptv2_error_ways%2Cptv2_error_nodes