Typically this type of policy is put in place so they can go after the true abusers. People that do nothing but surf all day or visit all the best (by which I mean worst) P0rn sites....
In anycase I think just to be safe, you had better set up an alternative URL for LoT. Something like: CongressionalResearch.com or DeweyLookups.com complete with fake front page and secret passthrough code...
Also if I feel the need to visit a non-work safe site from work I use VNC, Windows remote desktop, or some other remote desktop application to tap into my home PC. No router tracelogs there...