Technology provides some pain relief in the form of apps to let you know which roads are clogged, what gate your flight leaves from and whether trains are running on time. The American Automobile Association forecasts that the Wednesday through Sunday period will see more than 46 million Americans travel at least 50 miles from home — the most Thanksgiving road warriors since 2007. While Amtrak has an app that lets you make or change reservations and check the status of your train, local and regional public transit doesn't have the same range of resources as air travel. At least 70 percent of larger transit agencies have apps that offer real-time travel information, according to Darnell Grisby, director of policy development and research at the American Public Transportation Association. Sometimes the data that inform the maps are just outdated enough that they can lead a driver onto a freeway that may have been traffic-free five minutes ago, but now has a building bottleneck.