onTouch disable jumping?

NOT A REQUEST! This is in a regular script in workspace. This disables jumping What I want is for a person not to be able to jump when they touch a vehicle part. How would I do that?

game.Players.PlayerAdded:connect(function(player) -- This is when player joins

    player.CharacterAdded:connect(function(character)

        local humanoid = character:findFirstChild("Humanoid")-- We are making a variable for the Humanoid

        if humanoid then -- If player then

            humanoid.Changed:connect(function(property)--We are messing with the player now

                if humanoid.Jump == true then-- When the player trys to jump

                    humanoid.Jump = false -- This wont let Him.

                    humanoid.Sit = false

                    humanoid.PlatformStand = false

                end

            end)

        end

    end)



    local character = player.Character



    if character then

        local humanoid = character:findFirstChild("Humanoid")

        if humanoid then

            humanoid.Changed:connect(function(property)

                if humanoid.Jump == true then

                    humanoid.Jump = false

                    humanoid.Sit = false

                   humanoid.PlatformStand = false

                end

            end)
        end
   end
end)

To prevent a player from jumping *AT ALL on every respawn, we'll make the Jump property false everytime the Jump event is fired from their current Humanoid object.

game.Players.PlayerAdded:connect(  --Connects function to any player that joins the game
	function(plr)
		plr.CharacterAdded:connect( --Connects function to the Player's Character when it's added.
			function(char)
				local hum = char:WaitForChild('Humanoid')
				hum.Jumping:connect(
					function()
						hum.Jump = false
					end
				)
			end
		)
	end
)

As for preventing a player from jumping while in a seat, use the same approach as the above to only connect it when the character is seated.