The Express Lane is a priority request queue that makes LiveJournal faster for Paid and Permanent users. When logged into your Paid or Permanent Account during times of heavy site load, your requests for LiveJournal pages are sent to the web servers before other users' requests.
LiveJournal's main priority as a service is to offer all users, Basic and Paid alike, fast and uninterrupted access to the site at all times. LiveJournal's fast and numerous web servers ensure speedy access most of the time; however, like any service, LiveJournal does encounter unavoidable periods of heavy site load. The Express Lane is designed to speed access for our paying users during peak times.