Massachusetts is rather notorious for the placement of incorrect signage along its numbered highways. Some older, erroneous signs for state routes show numbers in a white circle rather than rounded square, with black on the outside; although not codified, a number of examples of this design remain extant. Some of these errors are due to outdated signage which have not been replaced since a realignment or truncation of a route, which can lead to confusion as to where a particular route goes. Lack of route signage in urban areas is a common problem.