Ok then,  
is this right? 
function createTeamsOnStart () 
local teamName,col1,col2,col3     
    teamGyg = createTeam ( "~GYG~", 255, 255, 0 )  
  
  
function setColors() 
    for i, car in ipairs( getElementsByType( "vehicle" ) ) do 
        local col1,col2,col3     
        col1, col2, col3 = getTeamColor ( teamName ) 
        setVehicleColor ( car,  255,  255,  0 , 0 ) 
    end 
end 
  
setTimer( setColors, 500, 0 )