Traffic jams of the data variety are locking up the website for Londoners affected by the imminent congestion charge. Lots of people are visiting the site to register before the charge is introduced on 17 February. But the large numbers registering for the charge or trying to pay before they travel next week are reporting that the site is being unresponsive. A study of the site by usability experts show that it ignores basic rules of web design and makes the process of registering unnecessarily difficult. http://news.bbc.co.uk/1/hi/technology/2758687.stm