Trigger a event to change a local?

FiveM Server Development Server Discussion
1

so i have a server command that triggers a client event with the command argument like this

TriggerEvent('es:addGroupCommand', 'density', 'admin', function(source, args, user)

TriggerClientEvent('scrp-scripts:fixtraffic', -1, args[1])
	
end, function(source, args, user)
	TriggerClientEvent('chat:addMessage', source, { args = { '^1SYSTEM', 'Insufficient Permissions.' } })
end, {help = 'Fordons densitet, 0.0 = inga, 1.0 = normalt'})

then i dont really know how to make the client do as i want:

local density = 1.0

RegisterNetEvent('scrp-scripts:fixtraffic')
AddEventHandler('scrp-scripts:fixtraffic', function(arg)
	density = arg
end)

Citizen.CreateThread(function()
	while true do
		SetVehicleDensityMultiplierThisFrame(density)
		Citizen.Wait(2)	
	end
end)

i want the density to be the arg number when the event gets triggerd which in that turn changes the SetVehicleDensityMultiplierThisFrame value