.Touched not working with local parts etc..

I've posted this on the scripting helpers forums, I'll post the whole post here as requested last time.

Right...

I just reworked the movement system of my game. It took me 2 days. I don't want to find out now that it STILL does not work! >.<

This is the game:

http://www.roblox.com/Traffic-Racer-V2-place?id=134174853

The issue is when a car hits another car, nothing happens!

I currently have this in a non-disabled local script inside a 'hit sensor' brick (which is the grey outline of the brick):

function checkHit(part)
print("TOUCHED PART HAS BEEN HIT")
if part.Parent.Parent.Name == "ModBlueCar" or "ModGreenJeep" or "ModPoliceCar" or "ModRedTruck" or "ModSchoolBus" or "ModSportsCar" then
if part.Parent.Parent.Name ~= script.Parent.Name then
print("Game over, players car hit something.")
car = script.Parent
hit = car.Hit
hit.Value = true
end
end
end


script.Parent.Touched:connect(checkHit)

Nothing prints and I'm getting scared ._.

I know I've not done the right parenting etc... I just want it to trigger the print function. Please can someone help >.<