They have a degree of political autonomy and are administered by elected representatives. The average population of each borough is around 21000, twice as high as in the previous division, which simplifies interactions with the municipal level and enables capacity building in each borough on matters relevant to road safety. While the whole city's transport and street network is planned and managed by the CML, the municipality has delegated maintenance responsibilities to the boroughs. For instance, formal agreements established by the CML with the boroughs of Arroios, Beato, Belem, Benfica and Misericordia has led to the upgrading of almost 150 pedestrian crossings. The CML provided funding, technical guidance and supervision, and the boroughs selected the target crossings, developed the designs and did all the construction, ensuring proper communication and consultation with local stakeholders along the way. At the same time, since 2014 the city has begun addressing its pressing ageing challenges in a comprehensive manner by deploying strategies in a variety of policy areas.