During the Great Depression, city revenues dwindled. With parking meters, however, a new source of municipal revenue was found. Not only did the nickels paid in by parkers accumulate, but so did the fines imposed for over parking. By 1944, American cities were generating some $10 million annually from parking meters alone. Soon after came meter maids, who, because they were paid less than police officers, increased city revenues further. Complex parking rules, restrictions and regulations are now an integral part of modern life and landscape.