can i do this?

[GamerDeMTA]

Is this code OK?

function lol () 
setWorldSpecialPropertyEnabled ("aircars", source, true) 
end 
  
addEventHandler ("onPlayerJoin", lol) 

[iPrestege]

No it's not :

-- # Client Side : 
addEventHandler('onClientResourceStart',resourceRoot, 
function  (  ) 
        setWorldSpecialPropertyEnabled ("aircars", true) 
    end 
) 

It's a client side function .