"What would Jane Jacobs think?" has been a question in urban planning and urbanist circles for years. That's no surprise—after reading her work, it's impossible to walk around a city without an internal Jacobs meter evaluating the lengths of blocks or the mix of old and new buildings. With this quiz, test the neighborhoods where you spend time on how well they meet Jacobs's criteria for a vibrant city. In the comments, tell us what makes your neighborhood more or less Jacobs-approved.