As Phil Haack explains on his blog entry, the Route Debugger helps visualizing your routing tables.
My site however gets it's routing injected by the MVCTurbine dependency injection (using Unity) like so:

public class DefaultRoutRegistration : IRouteRegistrator
{
    public void Register(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            "Accounts",
            "Accounts/{userName}/{action}",
            new { controller = "Account", action = "Index" }
            );

        routes.MapRoute(
            "Default",                                              // Route name
            "{controller}/{action}/{id}",                           // URL with parameters
            new { controller = "Home", action = "Index", id = "" }  // Parameter defaults
            );
        RouteDebug.RouteDebugger.RewriteRoutesForTesting(RouteTable.Routes);
    }
}

Where exactly can I throw in the the RouteDebug.RouteDebugger.RewriteRoutesForTesting(RouteTable.Routes); to rewrite my routing table?