How to change OSM so cycle.travel picks up best route

Hi there

I live in Wellington NZ. The recommended route into Wellington from the north puts cyclists onto State Highway 1 (which is a very busy road) while for large parts of the route there is a perfectly acceptable bike path beside the road  cf  https://www.reddit.com/r/Wellington/comments/d2p4gd/how_to_cycle_from_wellington_to_waikanae/ 

From Paekakariki heading south the route should be the Te Araroa trail (a shared footpath beside the road and the sea) to Pukerua Bay; then Ara Harakeke and Te Araroa shared pathway ( mostly off road asphalt - small part is hardpacked gravel but rideable on a loaded touring bike) to Paremata station via Plimmerton and then west of the Main Trunk railway through Mana; Papakowhai Road and off road trails which work OK already as marked to Porirua Station , then Ara Tawa (shared footpath off road) connected by suburban streets to Takapu Road Station, by road to Johnsonville and then either down Ngauranga Gorge on shared footpath or roads through Khandallah - both to join Hutt Road shared path Wellington Station to Ngauranga Station (much of which is now a dedicated two way cycleway despite what the name says).

I'm not sure which tags need to be changed in OSM so that cycle.travel picks this up automatically and recognises the off road routes as being usable bike paths as well as walking paths. Maybe a link to the relevant instructions in OSM for those who want to help by adding in their local details? 

Interesting ride into the harbour

Hi there.

Not sure what causes this but playing with the routes from home - set starting point as Hataitai Road (Wellington NZ), ask for a recommended ride and get one that takes me out into the middle of the harbour on one line of ferry and then wants me to swap onto another ferry to come back and complete the loop.