Roblox speed boost pad script

-- Speed boost pad: faster walking for a short time.

local BOOST_SPEED = 40    -- the normal WalkSpeed is 16
local DURATION = 5        -- seconds the boost lasts

local part = script.Parent
local boosted = {}        -- humanoids that already have a boost running

part.Touched:Connect(function(hit)
	local humanoid = hit.Parent and hit.Parent:FindFirstChildOfClass("Humanoid")
	if not humanoid or humanoid.Health <= 0 then
		return
	end
	if boosted[humanoid] then
		return
	end

	boosted[humanoid] = true
	local originalSpeed = humanoid.WalkSpeed
	humanoid.WalkSpeed = BOOST_SPEED

	task.wait(DURATION)

	if humanoid.Parent then
		humanoid.WalkSpeed = originalSpeed
	end
	boosted[humanoid] = nil
end)