@staticmethod
def equivalent(tag):
    """Simplifies a bunch of tags to nearly-equivalent ones"""
    equivalent = {'motorway_link': 'motorway', 'trunk_link': 'trunk',
        'primary_link': 'primary', 'secondary_link': 'secondary',
        'tertiary_link': 'tertiary', 'minor': 'unclassified', 'pedestrian':
        'footway', 'platform': 'footway'}
    return equivalent.get(tag, tag)
