sentence: Many passes are closed in winter.
sentences_before: The Alps are popular both in summer and in winter. The Alps as a place for sightseeing and sports. In summer, the Alps are popular with hikers, mountain bikers, paragliders, and mountaineers. There are also alpine lakes which attract swimmers, sailors and surfers. The lower places and bigger towns of the Alps are well served by motorways and main roads, but higher passes and by-roads can be bad even in the summer.
sentences_after: The Alps normally has more than 100 million visitors a year.
concept_name: pass
headings: Alps Travel and visitors