ArcGIS for State Government just released (March 2016) the Transportation 511 solution for implementing traveler information and winter weather web applications. There are a couple of really exciting things about this solution. First, it is implemented as a widget (Info Summary) in Web AppBuilder. This is great because you have a ton of control over what Web AppBuilder apps look like (themes and layouts) and it will look great on a mobile device. So your traveler information site can have the look and feel of the rest of your website but still have all the power of Web AppBuilder. You can also use any of the other widgets in Web AppBuilder. The second exciting thing about this solution is the scalable architecture. This solution was built from the ground up with scalability in mind. So no matter if you have 10 or 10,000 people hitting the app, everyone will get great performance. Behind the scenes this scalability is implemented using ArcGIS Online Feature collections that get updated by python scripts running on premise. All of this is documented (and supported) in the solution.