Depends on where you are, where you are going how late/early in shft WORL? Skills you have and items aquired before such times.
Can you fly fixed wing ? Rotary? Jet? Can you sail or navigate a water vessel and read charts? Can you start a locomotive? How do environmental conditions affect your area? Snow,sleet, ice storm, sand storm, hurricanes, earthquakes volcanoes?
How many are travelling? Are you properly supplied? Are you carrying all your gear or going to all your gear? Age and health of travellers?
Too many variables without any information.
Two easiest ways would be have a bike with a two behind you can dump easy if in need. Have older deisel with cow catcher bumper and plow through. Have enduro and put a very good muffler on it and pray not too much attention.
Question is can YOU use any of them with skill? All are zero good if you don’t have expirience. Bike with a load, next day you won’t be able to walk if not in bike shape, you can be a marathon runner and bike will slay you as muscles are different and if not adjusted to hight you will have problems. Plus if you need to dismount fast you will hurt yourself.
Water, you can drown or atleast lose your gear if accident.
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Walking is main way but do you have maps and alternates maped out for choke points? Radio to hear if infrastructure is no longer working? Field glasses to recon crossings or choke points? Covering fire incase it goes wrong?