One thing that's been really noticeable to me here in New York City is the fact that police walk the beat. Sure, they also drive around, but I ran into a lot of uniformed police just walking the streets yesterday. I've been racking my brain, but I can't remember any examples of this happening in LA.
What does it say about a city's walkability that NYPD finds it a cost effective use of resources to have police patrol on foot? Not only does it save money, it helps the environment and reduces noise not to have as many squad cars zooming around.