cycling not allowed on the highway itself, the service road consists of segments of asphalt (mostly former highway) and smooth gravel, continues a bit further towards Mikkeli (as well as in the other direction), but between the next junction and Otava you either have to take a longer detour than from here via Hirvensalmi or brave the traffic on the highway for a while (really I’d recommend picking a different route unless you absolutely have to ride this way)