The principal caratteristic of Traffic Plus+; is that includes, [Add-On] vehicles support.

from the other file you will find links for the vehicles than Traffic Plus+ includes;

so if you are installing (or you alredy have) a pack that is included in Traffic Plus+
you will see this cars in traffic.

+----------------------------------------------------------------------------------+
|PLEASE, IF YOU GUYS HAVE SOME IDEAS ABOUT WHICH [Add-On] VEHICLES ADD IN TP+ Misc;|
|You can suggest them in the comments!+--------------------------------------------+
+-------------------------------------+

when one of all this [Add-On] vehicels will update, wait an update from Traffic Plus+ too!