In the US (especially in the West) there are a lot of roads that are seasonal and/or that should really only be tackled with appropriately equipped high-clearance 4WD with a driver who is familiar with driving under those conditions.
Even a fairly straightforward off-paved road route like to the Racetrack in Death Valley, sees the local Jeep rental/tour company rescuing standard passenger car drivers all the time because they get tire punctures with no or crappy rental car jacks, etc. (Or they change tires and the doughnut spare lasts for 5 minutes.)
I've fiddled with Google Maps in the Death Valley area and my experience was that it wouldn't take you on stupid routes just because they are shorter. But if you give it a destination that can only be reached by a challenging road, it will route you on it.
> because they get tire punctures with no or crappy rental car jacks, etc. (Or they change tires and the doughnut spare lasts for 5 minutes.)
The sharp rocks of Death Valley and other super arid parts of Nevada was not something I had really thought about until I saw a picture of the car from one of my friends in Nevada. In addition to the normal full-size spare tire, there were two other tires stuck in the back of the car. He worked in a mine and apparently the road up there was full of these sharp rocks so there were days (not often) that he had to change 2 tires during his commute.
I imagine that it is particular type of rock prone to fracturing with sharp edges. But I also wonder if the sharper rocks more common because of the super arid conditions and are not worn down by the weather.
I drove on a farm track in the Coromandel, New Zealand. The track was very steep and there was lots of wheel spinning getting through. The sharp rocks messed up the tyres. On closer inspection the rocks were bits of volcanic obsidian.
Even a fairly straightforward off-paved road route like to the Racetrack in Death Valley, sees the local Jeep rental/tour company rescuing standard passenger car drivers all the time because they get tire punctures with no or crappy rental car jacks, etc. (Or they change tires and the doughnut spare lasts for 5 minutes.)
I've fiddled with Google Maps in the Death Valley area and my experience was that it wouldn't take you on stupid routes just because they are shorter. But if you give it a destination that can only be reached by a challenging road, it will route you on it.