A part being able to detect the difference between a player and another part. Any help?

I have built a car with parts that act as "airbags". When something hits the "trigger" that's under the hood, the "airbags" then turn visible and cancollide is set to true. At the same time, the throttle is also set to "0" and high friction "brakes" under the car are then activated.

My question is, how do I get the "trigger" ,that the script below is in, to tell the difference between a player and a part. I don't want anything to happen when a player touches the "trigger" but when a part hits it, I want the script to run.

This is what I have. Yes its long and super basic.. sorry about that..

function onTouched(hit)
	script.Parent.Parent.Part1.CanCollide = true
	script.Parent.Parent.Part2.CanCollide = true
	script.Parent.Parent.Part3.CanCollide = true
	script.Parent.Parent.Part4.CanCollide = true
	script.Parent.Parent.DriverSeat.Throttle = 0
	script.Parent.Parent.Airbag1.Transparency = 0
	script.Parent.Parent.Airbag2.Transparency = 0
	script.Parent.Parent.Airbag3.Transparency = 0
	script.Parent.Parent.Airbag4.Transparency = 0
	script.Parent.Parent.Airbag1.CanCollide = true
	script.Parent.Parent.Airbag2.CanCollide = true
	script.Parent.Parent.Airbag3.CanCollide = true
	script.Parent.Parent.Airbag4.CanCollide = true
end	
script.Parent.Touched:connect(onTouched)

Any help on this would be very helpful to me and I would be very grateful, thanks :)

You can use :FindFirstChild("Humanoid") to see if what has touched it has a humanoid.

distance = (part.Position - player.Torso.Position).magnitude
while magnitude do
if magnitude <= 100 then
print(magnitude)
else
print("Not close enough")
end
end

I originally had this problem with trains and railroad crossings. I use triggers on the rails to activate the signals, however people could have walked over a trigger and also set them off. Here is what I came up with.

local debounce = false

function onTouched(part)

	if debounce == false then

if part.Name == "Wheel" then

		debounce = true

[In here is where all of the signal codes are, you'll place your airbag stuff here.]

		debounce = false

	end

	end

end

script.Parent.Touched:connect(onTouched)

(The line "local debounce = false" at the top is line 1) Above, you'll notice that a part named Wheel has to hit the trigger, which is the brick this script is inside of. You may change the name Wheel to whatever the name of the part is that you want to trigger the airbag. If you set it to be triggered by a part named Part, it'll work with parts named Part. This lets parts with different names, and people, to have no effect on it. Also note that in putting the name, as you see my part name Wheel has a capitol W, caps count. So a part named wheel would NOT activate it unless it had a capitol W, like Wheel. To sum up the above, if you put in the name "Part" to substitute for my name "Wheel" then only parts with the name Part (capitol P) would trigger it. People or other parts would not. Hope this helped!