valhalla360 wrote:
Not sure about apple (but I'm betting it's similar) but Google Maps usually tries to get you from your start point using small local roads (if needed) working quickly to a high level road (arterial/freeway/etc). Then when you get close to your destination, it will reverse the process taking you to smaller more local roads as needed.
The only time we ever had issue with it is once, we should have driven past the first exit and backtracked a couple miles to get better roads. But that was on us as we didn't check the route before setting out.
It also typically gives you multiple options and there are some settings to adjust (avoid tolls, shortest distance, etc...) depending on your preferences. It's a good idea to explore those. I generally avoid tolls but if it's going to add 2hr to the drive, I'll happily pay them (usually obvious if you look at the route). Also, some times there is negligible time/distance between alternatives, so you can pick the one that appears to be higher level roads.
I wouldn't trust any system blindly. Particularly if you get off Interstate and US routes, best to zoom in and look at the proposed route ahead of time.
If you are in the mountains, I suggest downloading Google Earth (different from Google Maps). It's free. The advantage is you can plug in your route and if you right click, it gives you the option to show the profile. Now you can see where the steep sections are, what % grades to expect and if they are in a twisty-turny section. Also, you can zoom into smaller roads and enter "street view" to see if they are gravel or if they are very narrow.
Another item to understand is the road numbering convention.
- "I" routes are interstates freeways. Pretty much never going to be an issue (other than possibly congestion).
- "US" routes are the next level down but still major arterials. Depending on location and traffic demand they may vary from freeway to 2 lane-2 way but almost always suitable for trucks.
- State Routes, usually designated by the first initial of the state (ie: in Michigan "M" routes). Still typically arterials suitable for trucks. Typically, surface roads (not freeways but there are exceptions) but otherwise major arterials.
- County Routes, designation is a little less clear but typically a numbered route. These are often considered "collector" roads. They probably are suitable for trucks but it's less clear cut.
- Local Roads: Typically not numbered. They may or may not be suitable for trucks and you really should look closely before taking them
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