In recent years we have been able to reduce slightly the area affected by the Lord Mayor's Show, but it still covers a large part of the City of London.
Most roads in and around the City of London will be completely closed for most of the day of the Lord Mayor's Show, admitting no traffic whatsoever. Most parking bays close to the route will be suspended from 6.30 in the evening before. The closed area extends from Kingsway in the East to Bishopsgate in the west, and from the river up to Holborn and Chapterhouse Street. All those roads are open; everything between them is closed.
The closed area is slightly smaller than it has been in the past but for through traffic the effect is much the same: rather than going through the City you will be sent round via Old Street or across the river. Most roads will reopen between 3 and 4pm, but the Embankment area will remain closed until about 6pm for the fireworks display.
There may also be traffic restrictions on roads in the region extending north to Old Street and Clerkenwell Road, and you can expect heavier than usual traffic in the surrounding area as cars are rerouted.
For more detail, please click above for the City's official boundary map (6MB PDF file) which includes more street labels and shows the exact boundary line. There may be detail changes in the build-up to the Show, so if you have particular concerns please watch this page or follow the Show for updates.
London Bridge is open as normal. Southwark Bridge is open but not very useful: access to the north end is only from the east, along Upper Thames St. Blackfriars bridge is closed all day, along with Victoria Embankment, and Waterloo Bridge will also be closed between about 4pm and 6pm for the fireworks.
There are no special cases. The secure area is very secure indeed and its perimeter heavily policed. Early in the day a resident of the Barbican might be able to drive out along Beech Street or Aldersgate, but not after about 9am, and there is no chance that they would be allowed to drive back in.