Provence-Alpes-Côte d'Azur daily basis, but cities are investing in public transport networks such as Marseille's subway (2 lines) and tramway (3 lines), Aubagne's tramway (1 line) and Nice's tramway (1 line). Other networks existed at the beginning of the 20th century in smaller cities such as Aix-en-Provence, Avignon, La Ciotat and Toulon but are now gone. Major universities of the region include the Aix-Marseille University, the University of Toulon, the University of Avignon and the University of Nice Sophia Antipolis. Other towns have higher education classes but no Universities. Provence-Alpes-Côte d'Azur Provence-Alpes-Côte d'Azur (; ; ; PACA) is one of the 18
Alpes-de-Haute-Provence of 39.4% for the Provence-Alpes-Côte d'Azur region. The National Office of Forests (ONF) manages 86,000 hectares. The main species exploited are Scots pine, black pine, larch, pubescent oak (or white oak), and beech. Fir and spruce are less common. The 2003 heat wave caused the decline of many species of trees, consequently accelerating the return of Mediterranean oaks, alders and linden. Industry is relatively small in terms of business establishments but has several relatively large companies. At the end of 2004 the department had 937 establishments with 17 exceeding fifty employees. This is particularly the case of the historic plant