def is_street(node):
    """
    Checks if a given node object is a street.

    Parameters
    ----------
    node : graph.nodes[id] object

    Returns
    -------
    is_street : bool
        True, if node is of node_type street
    """
    if 'node_type' in node:
        if node['node_type'] == 'street':
            return True
    else:
        return False