# Troubleshooting

### :sos: The vehicle cannot drive

{% hint style="success" %}
Make sure, the wheels of the vehicle have a sphere collider attached and use the Wheels Physics material
{% endhint %}

![Wheel Physics material](/files/-MRKaOSrvFk1V-WM5qpE)

{% hint style="success" %}
Make sure, the **Ground** layer is setup properly in the **Vehicle Ground Detection** and on the game object of the racing track. The vehicle will only detect a collider as ground, if it's layer is set in the vehicles list of Ground Layers!
{% endhint %}

### :sos: The camera is stuttering in the Editor

{% hint style="success" %}
In Unity 2019.4 we noticed that **Cinemachine** seems to stutter if an Game Object is selected in the inspector when in **Playmode**. **Deselecting** any selected object fixed that! 

(Please not this issue is related to Cinemachine and not to the Arcade Racing Kit itself)
{% endhint %}

###  :sos: The vehicle hops on composed track parts

{% hint style="success" %}
If your track is composed of multiple small colliders, it can happen that the vehicle hops sometimes when driving over a contact point of two track parts, due to the way Unity's Physics System work. This can be fixed by setting

**Project Settings -> Physics->** **Default Contact Offset** to **0.0001**

Nevertheless, we recommed to make your track being composed of as few as possible colliders.
{% endhint %}


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