Hi Danny,

probably the emissive mesh of your lightbars is just compounded to LOD0. To check this try increasing the distance that renders the LODs in your vehicles.meta like this:

      <lodDistances content="float_array">
        500.000000
        500.000000
        500.000000
        500.000000
        500.000000
        500.000000
      </lodDistances>

be carefull, this might be challenging for bad PCs.
If this fixes your problem, you need to modify the vehicle in zmodeler.

best regards
Sammy