Originally few in number, they have multiplied over the years, from 18 in the early 1990s to at least 59 as of late 2017;[2] in total they stretch over 34 kilometres (21 miles), with most located in Belfast.
[3] Three-quarters of Belfast's estimated 97 peace lines and related structures (such as gates and closed roads) are in the north and west of the city.
Black taxis now take groups of tourists around Belfast's peace lines, trouble spots and famous murals.
[10][11] At the end of 2011, several local community initiatives resulted in the opening of a number of interface structures for a trial period.
[18][19] In September 2019, a series of events were held in Belfast to mark the anniversary of 50 years of peace lines in the city.