[TyThaBomb]

Let me give you an example.

pawn Код:

command(enter,playerid,params[])
{
    if(GetPlayerState[playerid] != PLAYER_STATE_DRIVER) // They're NOT in a car
    {
        //SetPLAYERPos, not SetVehiclePos.
        //SetPLAYERInterior here
    }
    else
    {
        new vehicle = GetPlayerVehicleID(playerid);
        //Then, set their VEHICLE position.
        //LinkVehicleToInterior, or whatever that function is.
    }
    return 1;
}

There, you can see I checked their state, if they were a driver of a vehicle or not. Then, if they WEREN'T in a vehicle, I'd set the PLAYER pos, and if they WERE in a vehicle, I'd set the vehicle pos.