open street maps does not handle temporary road closures, construction, or temporary one-ways well
that sadly depends on your region and the amount of volunteers in your area. I remember reading how OSM was more reliable after the 2023 Turkey earthquake for the first responders than Google Maps, because the changes in the terrain were added there much faster.
I don't know about the road conditions during the navigation. it definitely does support this kind of data as I input it myself every now and then, but I don't drive so I haven't had to try out different OSM navigation algorithms to see if they account for it, or anything like that.