The A3214 is a short A-road to the south of Westminster.
The road starts at traffic lights where it meets the A3216 and B302 on the corner of the grounds of Chelsea Royal Hospital. It heads eastwards along Pimlico Road to reach traffic lights where it TOTSOs left into Buckingham Palace Road.
Buckingham Palace Road
The road continues roughly northwards and crosses the A3213 at traffic lights. It now runs alongside Victoria station as part of the area's one-way system, although the road remains two-way to begin with. Before reaching the front of the station northbound traffic is forced to turn left onto the A302 (originally the A3215 and still given that number on several maps) on the corner of Grosvenor Gardens. The road is now southbound only (with contraflow bus lane) past the Gardens to a signalised crossroads on the A302, where the bus lane disappears.
The far end of the one-way system is met at the next set of lights where the A3217 Grosvenor Place is crossed. The road becomes two-way once more and runs past the Royal Mews and the back garden of Buckingham Palace to reach the Palace itself. The road ends here at a set of traffic lights. To the right is the B323 whilst ahead is St James's Park. As one of the Royal Parks it contains no classified roads.
The original western end of the A3214 was at Sloane Square, where it turned off the A3217 and headed south along Lower Sloane Street to reach its current route. When the A3216 was extended south to cross Chelsea Bridge it took over this section of road.
Although the eastern end of the A3214 is in its original place the road has been extended in the interim. By the middle of the 20th century the road continued east along Birdcage Walk (although as mentioned above, this actually remained unclassified due to its being in St James's Park). The classified road reappeared at Horse Guards Road and the A3214 ran along Great George Street to end on Parliament Square. This section was declassified again in the 2010s.