I think I was a bit to fast with my assumption that the crawler transporter is heading back from the launch pad. I have re-checked the cams and it has not moved an further. So I assume we see it in its parking position. That seems to be normal – the crawler transporter seem to typically stay a while at the pad after the space shuttle has been delivered.
I have also dug out an up-close picture of a crawler that I made on my last visit of Kennedy Space Center in September 2006. Look at the left – there you can see one of its driver’s cabin. Think that people are in there, then think about how big it is ;)