How do you make a player boost forward?

Hi, I was just wondering on how to make a player boost forward when they touch a ramp but after they leave the ramp they stop moving as fast. like the ramps in Legends of Speed.

Use a really strong conveyer. There is a model from the toolbox (i know, a free model) that is free and has an arrow to show you and no viruses. Next, go into the script inside the conveyer and change the number from 50 to 200. Then make It invisible and delete the decal. then you have a boost!

This this as a script inside of a part. when you touch it it boosts you for 5 seconds!

debounce = false

script.Parent.Touched:Connect(function(plr)
	if plr and debounce == false then then
		debounce = true
		local humanoid = plr.Character:FindFirstChild("Humanoid")
		humanoid.Walkspeed = 25
		wait(5)
		humanoid.Walkspeed = 16
		debounce = false
	end
end)