SCNPhysicsVehicle SCNPhysicsVehicleWheel Road Issue

I am testing on a little car game using Apple's SceneKit, to simulate the car behavior I'm using SCNPhysicsVehicle class.


For the first development steps I drove the car on a big area. This worked fine. I've set up all the car variables so that it felt like expected.

In the next step I wanted to build the road. Naturally the road should consist of parts so I can create different racing tracks.


Here is where the trouble begins.


I just made a straight road consisting of 50 blocks. The blocks line up a 100% perfect.


Anyway the car bumps and "jumps" in every place where two road blocks meet.


For better understanding I made a Video showing the wired behavior:


https://www.youtube.com/watch?v=X0eS2G5_RlE


Did anyone ran in the same issue? What I'm doing wrong?


Any thoughts or suggestions would be appreciated.