... and that's why I have a 20 year old Classic Rangie sat on the drive...
The ability to read an OS map is handy too.
Had a similar experience once with snow falling then thawing then freezing solid on the A720 Edinbugh Bypass, outside lane was clear so just stuck her in bottom box, locked the centre diff and gently trickled my way home passing all the traffic in the inside lane at about 10MPH. Felt smug at all those who tried to follow my trick and just failed as they weren't in a 2.5 ton AWD vehicle with decent tyres on and the ability & experience to use it.
Always had a landy of one sort or another for these instances never failed to get home and never met any significant delays (just driven round it).
Proper Planning and Preparation prevents piss poor performance