Help building race track

I have built a race track above my island,the first piece of track i snapped to the grid and in edit dragged a copy of that one and kept doing that to make the track,it looks perfectly flat and seemless.
The problem i am having is one of my cars seems to hit spots on the race track and becomes air born and land further down the track,i have remade one section but it still does that.
Last night i bought another race car,this one does nt hit spots and become air born but it is very wobbly on the race track,it does nt seem to hug the track but seems to react to things i don t see on the track surface.


Is there a special method to building a race track surface.i have been on other tracks and they seem good,my cars hold the track good and don t react to the surface as they do on my track.
I would really appreciate any help

The trees are phantom I guess? Since the prims sometimes stretch a bit further then the image shows.
Also look for lag sources on the sim. Many racetracks are rather tight on requirements to visitors, and it does help to some degree:
-limited amount of visitors,
-*no scripts* in the entire sim apart from those required for the racing (so this includes AO's, scanners, vendors, etcetera). Some even go as far as not allowing flexi skirts or flexi hairs, except on one or two appointed boothbabes.
-What kind of prims are you using? megaprims for the long stretches, or nothing but 10*10*0.5 ? Megaprims are more prone to letting moving avatars and objects on them momentarily sink through. Just a split second of sinking through the floor, even if your viewer hardly records it, can cause the next few meters you ride to feel "wobly"

Also, try moving your race track a bit further up. On your picture, the ground level shows quite clearly, which means smaller and bigger objects may pop into viewer distance all the time. Ideally, you don't want anything to render at all, except the track itself, the cars, and a minimal amount of "landscaping" around it. If an object coming into view spikes your lag for just a split second, it will probably affect your ride already.

The track is made from stretching a cube to its max size and in edit dragging a copy along to make the track,there are only two avys using the track.
We do have a walk anim and mysti hud and i guess flexi hair and skirts but they don t seem to affect other tracks,
I could try raising the track higher,maybe remove the trees and see if that makes any difference.
There are scripts on the island but nothing that seems would cause a problem.
I have noticed that when a friend comes on the island and logs out the car goes through the track momentarily and i'm in mid air but then appears back on the track,almost like a sim crossing