When building Responsive webpages the Telerik navigation control to use is RadNavigation because it properly resizes when the screen is rotated unlike the RadMenu.  

However RadNavigation doesn't seem to have a way to see my current location within a website which is where the breadcrumb come is.

The addition of breadcrumb integration with RadNavigation would benefit Responsive web designer using the Telerik controls.

As for example:
1) the skinchooser in this demo -http://demos.telerik.com/aspnet-ajax/navigation/mobile-and-touch-support/responsive-behavior/defaultcs.aspx?product=navigation
2) the top left corner menu in this demo: http://demos.telerik.com/aspnet-ajax/mobile.aspx
3) http://mobify.github.io/pikabu/