Foud this interesting, you can read it here : www.myphilippinelife.com/the-jeepney-and-the-Marsden-mat Or at here, for its history available in the wiki .. See how important it was there and why widely it been used, from Normandy to Papua New Guinea .. Being a simple(!) 3m/.38m perforated high manganese-steel plate, enable to construct a 1.5km of very reliable air strip, just within a period of 24 hrs. !!