Yep, highways and a minimum of a 406 G/PLB are very good things to have. This time of year though the highway trick may not be that friendly either if the weather goes to hell on you enroute.
My apologies for ignorance. What is 406 g/PLB?
406 is the frequency the COPAS/SARSAT system works on. This is the worlds only dedicated SAR system, and only a 406 device will activate it, not a SPOT, not a Cellphone or whatever. If the number on the device is 406, that's what it does.
There are three basic models of 406 devices, ELT with an automatic shock switch that are used in aviation, an EPIRB which floats and is automatically activated when it goes in the water, and a PLB (Personal Locator Beacon) which is smaller (about the size of an old Nokia cell phone these days) and only has a manual trigger.
The G/ stands for GPS enabled. It is an option to the system, it works without the integral GPS, but depending on timing and location, it may take up to 40 minutes to derive your position using I believe Doppler shift from a couple of satellite passes. With the G/ option they basically have your position within 15 seconds of you pushing that button and satellite gets the GPS data and transmits it the Earth station, and the appropriate station assigns an individual the responsibility to see your file through to the close, and within a minute or so they are making phone calls to find you first. If they can't contact you and nobody knows you are ok, then equipment starts moving pretty quickly to find you.
A G/PLB is now under $300, it is the best $300 a person who travels a lot can spend. I don't know if it is true, but I heard a story in Asia where some guy got kidnapped and had his G/PLB in his pocket and was rescued through triggering it.