The New York City subway system is quite an engineering feat with its 24-hour-per-day operation, 468 stations, 660 miles of track, and an annual ridership of 1.64 billion, but any New Yorker will tell you that frequent preventative maintenance can get in the way of all of that. Thankfully, starting today, it should be easier to avoid service cancelations and other issues now that Google has integrated MTA service alerts into Maps on Android and online. The warning will only pop up for planned changes for now — if a train is stalled for "signal problems" you're not going to hear about it — and they will show up right along with directions. The feature has been live in other cities for quite a while now (most recently London). It's been a long time coming, but it's finally here.