Heh, I assumed you were talking about young children and your response suggests adults. In that case I’d say it’s even easier - they already live their own lives and you have more flexibility to live yours the way you like and where you like. Travel is always a pain, but the bigger deal the trip is the more meaningful the visit.
It’s a balancing factor that is supposed to make escaping to a secure location feasible. If zombies maintained full speed we’d basically have a force that is dumber humans with the ability to exponentially force-recruit and not caring about personal safety. This would be a very short struggle for everyone not physically separated from them at the start. It would be normies vs a growing crowd off their rocker on pcp.
On the other hand if you want to introduce any degree of realism: