Tempomat postet zweimal.

function onPlayerJoin()
	bindKey(source, "c", "down", cmd_tempomat)									
end
addEventHandler("onPlayerJoin", root, onPlayerJoin)


function cmd_tempomat(player, command)
	if(isPedInVehicle(player)) then
		if(isTimer(tempomat)) then -- Tempomat wurde bereits eingestellt
			killTimer(tempomat)
			outputChatBox( "Speedometer turned off!", player)
		else
			if(getElementSpeed(getPedOccupiedVehicle(player)) > 15) then
				local tempo = getElementSpeed(getPedOccupiedVehicle(player), "kmh")
				tempo = math.round(tempo)
				outputChatBox( "Speedometer turned on! ("..tostring(tempo).." km/h)", player)
				tempomat = setTimer ( setSpeed, 250, 0, player, tonumber(tempo) )
			else
				outputChatBox( "You have to be at least 15 km/h fast!!", player)
			end
		end
	else outputChatBox( "You are not in a Car!!", player) end
end
addCommandHandler("tempomat", cmd_tempomat)




function setElementSpeed(element, unit, speed)
	if (unit == nil) then unit = 0 end
	if (speed == nil) then speed = 0 end
	speed = tonumber(speed)
	local acSpeed = getElementSpeed(element, unit)
	if (acSpeed~=false) then
		local diff = speed/acSpeed
		local x,y,z = getElementVelocity(element)
		setElementVelocity(element,x*diff,y*diff,z*diff)
		return true
	end
 
	return false
end


function getElementSpeed(element,unit)
	if (unit == nil) then unit = 0 end
	if (isElement(element)) then
		local x,y,z = getElementVelocity(element)
		if (unit=="mph" or unit==1 or unit =='1') then
			return (x^2 + y^2 + z^2) ^ 0.5 * 100
		else
			return (x^2 + y^2 + z^2) ^ 0.5 * 1.61 * 100
		end
	else
		outputDebugString("[getElementSpeed]  No Element")
		return false
	end
end


function setSpeed(player, speed)
	if(isPedInVehicle(player)) then
		if((getElementSpeed(getPedOccupiedVehicle(player),"kmh") < tonumber(speed)-15) or (getElementSpeed(getPedOccupiedVehicle(player),"kmh") > tonumber(speed)+4)) then
			killTimer(tempomat)
			outputChatBox("Speedometer turned off!", player) -- Bei Crashes, Bremsen, Gas geben etc.
		else
			setElementSpeed(getPedOccupiedVehicle(player),"kmh", speed)
		end
	else 
		outputChatBox("Speedometer turned off!!" ,player)
		killTimer(tempomat)
	end
end


function math.round(number, decimals, method)
    decimals = decimals or 0
    local factor = 10 ^ decimals
    if (method == "ceil" or method == "floor") then return math[method](number * factor) / factor
    else return tonumber(("%."..decimals.."f"):format(number)) end
end