''Al Jazeera'' describes Port Moresby as "one of the most dangerous cities in the world".   Parts of Port Moresby have security problems with house break-ins being the main problem.  Fences topped with razor wire, security lighting, alarm systems, guard dogs, locked gates and walls are considered necessary around houses and apartment buildings. Carjacking is now rife in the capital and stopping at the few functional traffic lights is not recommended after dark when marauding gangs gather at the intersection(s).  Security guards are widely employed as the police force is underresourced and weakened by internal corruption.  Travel by foot is not recommended in and about the city and suburbs due to continuing breakdown in law and order. The UN Global Compact Cities Programme, using a method called Circles of Sustainability, has assessed the urban security of Port Moresby as 'critical'.