I find that, even if people are given travel hints by people who have done the journey before, they don't pay attention and just follow the sat nav. Despite the fact that it's well known the sat nav blindly assumes that you can travel at the posted speed limit and therefore takes you off perfectly good main roads to travel down roads that are technically 80km limit but are barely a car wide and have grass going down the centre and you have to back up to a gateway if you meet a tractor.
So, for instance, my DH was picking DD up from a friend last summer. I specifically told him not to come off the motorway at junction 18 like the sat nav tells you to, but to go on to junction 19 where it was a nice, straight, two lane, main road to the destination. Did he listen? No, and then I had a long story about how twisty and narrow and difficult it was to pick her up. I know how difficult the route from junction 18 is because I made that mistake, which is why I warned him, so that he didn't have to make the same mistake.
I also went away with friends for the weekend to somewhere that I have been loads of times and gave the same advice, stay on the motorway to X junction, then stay on the main road until Y village and don't let the sat nav take you any other way. Did they read my message? Did they fuck! They just put the Eircode in and drove. It should have been a 2.5 hours trip, and one of them managed to make it the best part of 4 hours and mentioned passing a landmark that was in no way along the route they should have been taking.
I feel like Cassandra, warning people of pitfalls but I might as well not bother.