Yes, there is a specific option to disable that (don't show parking dialogue, from the top of my head). Actually, that option was already introduced in the previous official update so it's already in the gameplay menu in the current version. I've got things set up in such a way currently that I do get no pop ups at all.
There's also multiple settings for showing up the route. Never, only in the take job screen, only on the map, both on map and job screen, or always, where the last options is the only option where the route will show on your dashboard route finder.
So it's possible to have your navigation on, but without it showing the route, so you'll need to drive by roadsigns, or open your map and find your own route (which can be good fun and ups difficulty)
And there's more options to turn on and off, such as fines for example.
That's all already in the current version, it came with the wheels update (where you can tune your wheels part by part, rim, cover, bolts etc)
But yeah, you can turn pop ups completely (I think the option is called 'never show route finder' from the top of my head), you also don't get any at the fuel station, when parking, at the job symbol, garage etc, non at all, you just stand on the symbols and press enter because you know you have to.
