Just though you gentlemen may be intereted to know that The Metro's "Trip Planner" at kcata.org has been updated: it nolonger has the artificial restriction which limited to Windows+IE, and (seems) to work in Firefox cross OS, and also seems to work. It also seems to work in Konqueror, so I guess it should work in Safari.
It seems to be written with ASP.NET, so it is cookie laiden, and it uses AJAX in a way which I personally consider to make it less useful that its previous version.
Contrastingly, Time Warner Cable's online chat claims to support Netscape and IE only, so far I've tried it in IE. So unless it really works in Netscape, no cross OS, or even Firefox support. The support-analyst I spoke with, they will be focusing on IE because "Firefox does not come bundled with Windows, so we know that everyone will have Internet Explorer" , which of course presumes that only Windows exists - but the chat service is at least better than their telephone answering service.
Peace