I don't know why, but I've been noticing lately 1/10 mile marker signs on highways (specifically 202 and 100 in PA, but I'm sure they are in DE too), and I have to wonder, why are they there? They seem to be a waste of metal and are kind of an eyesore to see every tenth of a mile.
What are they there for? The only thing I could come up with was if you break down you can give your location to a tenth of a mile. But wouldn't markers every mile (rather than tenth of a mile) do a similar thing but save a heck of a lot of metal?