No, we don't know from the RCMP which routes KM and BS took. Here's why basic information like the routes the victims took is very important. This is from LD's cousin, not the RCMP.
The trip to the Dease Lake area wasn’t part of original Dyck’s plans, Friesen said, adding he was only supposed to travel between Terrace and Stewart.
Family of B.C. murder victim remembers Leonard Dyck as ‘gentle soul,’ family man
The RCMP have stated that the victims were random, not targeted. Is LD's death considered random because he made a random decision to change his route?
It would be extremely random if LF and CD hadn't even travelled on the same highways as BS and KM. This would indicate that someone else is responsible for their murders.
It could be considered targeted if the victims and suspects travelled the same highways at the same times, if somewhere along the line the suspects formed a plan to follow and kill the victims.
We know that both LD and the suspects were on Highway 37. We don't know if CD and LF were ever on the same highway as the suspects.
I have attempted to explain why this is important previously. If the suspects themselves cannot be placed at the scene of the crime near Liard Hot Springs, and not just a random discarded item belonging to them, how can they be responsible for the murders?
The routes are very much a part of this investigation, I am sure, because this is very important information. If it was impossible for LF and CD to be in the same place as the suspects at the time of the murders, as proven by highway cams, security cams, etc., then the person or persons who killed them remain at large. This is my concern. Until there is proof, we don't know.