This is anecdotal, but I recall that Alabama put up highway markers in kilometers during the 1990's [1]. It confused people, and they cancelled the program. You

This is anecdotal, but I recall that Alabama put up highway markers in kilometers during the 1990's [1]. It confused people, and they cancelled the program. You can still find signs that haven't fallen down or been stolen in some places. [1] http://lamar.colostate.edu/~hillger/signs/AL.html http://lamar.colostate.edu/~hillger/signs/AL.html