title: How to detect that the 25000 request per day limit has been reached in Google Maps?
body: <p>I'm working on a website using the Google Maps Javascript API v3.</p>
  
  <p>The free version of the API is limited by 25000 requests a day. But what happens if this limit is reached?</p>
  
  <p>Is there a way to detect that the request limit has been reached so a fallback Google Maps Image API map can be displayed instead?</p>