200 miles is the worst-case scenario, but it's do-able for seasoned backpackers. If it's primarily on established roads, you can cover a good distance each day -- provided you have adequate food and footwear.
I agree, it is very doable. Using this scenario as an example but without the bridge and tunnel issue, I would not hesitate to start walking
if we had to. There is plenty of water available, food may be an issue after about 4-5 few days though..
- Information is going to be hard to come by, but if there is a radio station still transmitting in the area you'll want a small radio to tune in. Same with a cell phone -- if you can get a text out to let family know you're okay, that will relieve a great deal of worry.
Cellphone coverage is non-existent. CBC radio is sporadically available in a few spots though.
- A portable solar option to charge spare batteries for lights and other items may be worthwhile.
Not really a problem for lights this time of year. You live further north then I and know how much daylight we enjoy this time of year. Right now it is not getting fully dark until almost 10:00 pm and daylight breaks around 4:30 - 5:00 am. Winter is a whole different story..
Outside of the parameters posed, though, I have to say that if you are in a relatively stable zone with your vehicle and gear, I think the only real option is to stay put. Someone will be along in due course. Unless there's a town with a pub and air conditioning just over the rise ...)
I think one of the towns has a pub or two...good idea!