Google Maps fundamentally doesn't understand the difference between signposted speed, and practical speed, either.
I was on holiday in the UK a couple of years ago, down in south west, and it insisted on sending us down these really narrow, single-car-width country roads (with passing places). I grew up in the UK, and learned to drive on them, so no particular fuss with actually driving down them. The problem is they're "National Speed Limit" roads (60mph / 30mph in built up areas). They're just too narrow, and too twisty, to be able to come even close to it, let alone do it safely.
Unless there has been enough cars using Google Maps going down that road, within a recent enough time period so that it knows the road is currently slow, it'll send you down it assuming you're able to go at something approximating the limit. Sod the large road that's just a little bit further away and legitimately can be used at those speeds. It got almost farcical. I'd even attempt to persuade it otherwise, and part way through it would reroute and I'd still end up going down one.
I was at a cabin in California and thought I'd like to take another path out since the road in was all congested switchbacks and I just wanted a nicer drive, regardless of whether it took another 30 minutes.
google sent us on a fire road cut into the side of a cliff over a small stream. we really couldn't go more than 5 kph maximum and had to use a spotter several times to avoid going over the edge. when we encountered a car coming the other direction we all got out and tried to figure out how one of us was going to drive backwards until there was a turnout.
Ironically, for motorcycle trips those are the types of roads that I prefer. I can have a route pre-planned, and the app will reroute to the 'faster' route automatically unless I dismiss it. I ended up reverting to paper and only use the phone for route planning.
I was on holiday in the UK a couple of years ago, down in south west, and it insisted on sending us down these really narrow, single-car-width country roads (with passing places). I grew up in the UK, and learned to drive on them, so no particular fuss with actually driving down them. The problem is they're "National Speed Limit" roads (60mph / 30mph in built up areas). They're just too narrow, and too twisty, to be able to come even close to it, let alone do it safely.
Unless there has been enough cars using Google Maps going down that road, within a recent enough time period so that it knows the road is currently slow, it'll send you down it assuming you're able to go at something approximating the limit. Sod the large road that's just a little bit further away and legitimately can be used at those speeds. It got almost farcical. I'd even attempt to persuade it otherwise, and part way through it would reroute and I'd still end up going down one.