It looks like work very well, as Piddy's solution also do.
To be honest I do not bother to ride over track joints at all. Both solutions provide a smooth riding without bumps or car flights.
What bothers me is those flickering textures in merging zones. Even you perform a very precise adjustments, far out cameras showing flickers triangles sometime in game rendering.
See you
This is the problem with all overlapping textures or polygons and the biggest pain to eliminate. One other thing that seems to come to mind with over-lapping polys it the cars being sucked into the track in an around these sections of track ... especially in an off-road environment ... (although this may be more of an rFacter side-effect than a BTB issue)
I really try to steer clear from over-lapping polygons as it is the biggest turn-off for me to see flickering.
The only cure for me is to finish the track as best as I can then repair it in Simed by erasing, welding those offending poly faces ... this is really time consuming ... but still the necessary evil if you want you track to look right and not noobie-ish ...
But this is a HOT topic and I guess one that boils deep in a few of us BTB-Old-timers ...
In either event ... there will probably be a better solution ... someday ...
the best one is to avoid having to merge too many sections of track (chicanes, alternate routes & pit roads) ...
Personally for me, even the pit entrance and exit is too much to hassle with anymore.
I will still wait for that day ...
<joking> (and smile from heaven when it does) ...
along with the day that background blending the track surface textures with the background terrain texture materializes ...</joking>
Cheers ....