Google Maps is expanding its "transit crowdedness predictions" to 10,000 cities across 100 countries.
You can see how busy it is so you can hop on or wait it out.
Get this: If you live in The Big Apple or Sydney it'll tell you how crowded it is on a single subway car.
Right now, New York City, Atlanta, San Francisco, Boston and D.C. top the list for most crowded commutes.
