Oh, that sounds like fun! I'd love to see a game where you can just cruise through beautiful landscapes without the need to do something competitive. Just traveling from one place to another, taking different road sides from time to time and doing all that in a relaxed pace. Music would of course be the key...
This is my main inspiration, childhood memories of me and my family traveling with our car (red Zhiguli

) to the Black Sea (all-day trip) through Ukrainian landscapes, I always loved to stare at the window, loved the sudden stops, directions asking, villages, crop fields, road picnics for breakfast with eggs and such.
This is my biggest inspiration in making this engine. Get back to that safe and curious feeling, of exploring, safety, family warmth.
I just need coding help, heh.
In "Travel mode" I plan to allow for track creator of that particular track part to set Road Stop to share thoughts, personal and family memory stories and memories (or to memorize someone important), ideas, agendas...like places you visit. As tracks and worlds can combine to big worlds this can have a huge traveling feeling, with visiting, talking and even leave guestbook remarks those track makers can later read...Stopping to hear someone.
Allow me to share further ideas that come to mind. Looking at you image I could imagine a somewhat open world with a bunch of bifurcations where the player can choose to ride the highway, offroad, the city streets and so on.
Well, alot of themes are pre-planned with easy new theme crafting as well, I did plan road splits and blocks like in OutRun too.
Still, this is not a full 3D world, just road with possible splits, maybe even merges.
That's actually a super awesome idea!!! I'd love to see that!
Find me a good coder to help

My current coding skills currently can't ensure this great idea will come to...a good ending.
Meantime implemented - road, hills, curves, collisions, player car/driving, offroad managing, centrifugal, road lanes, landtypes, easy setting of different themes - from road strips and while road side themes (mix and match), scenery managing by scenery type (tree type, bush type etc. engine knows already how to spawn, what amounts, gaps, offsets etc.), scenery mirroring on road sides, smart by-landtype scenery generation - for example automatically not to spawn non-sea-type scenery over sea landtypes....
Alot yet to code - other cars, tunnels, cliffs, bridges, road obstacles, particles, weather effects/fog, crossing traffic and much much MUCH more.
Didn't even start on UI/interface.
This idea needs futher coding assistance, what can I say.
Meantime struggling myself, spending all of my free time on it.