The A102 is a road that starts in Clapton in the north London Borough of Hackney and ends in Kidbrooke in the south Royal Borough of Greenwich. The A102 was formerly a continuous route including two motorway sections classified as the A102(M). However, subsequent to the renumbering of part of the route in 1999, the A102 designation belongs only to the section including the Blackwall Tunnel linking the A12 and the A2 and to the section from Clapton to Hackney Wick.
The A102 starts in Clapton at the junction of Lower Clapton Road and Urswick Road. It runs south along Urswick Road and continues east past 16th century Sutton House, East London's oldest house, and into Homerton High Street. It next turns south and runs along Kenworthy Road and then east into Wick Road for a short distance before the road designation ends at the A106 just to the west of the Hackney Wick interchange with the A12.
South of the A12/A13 interchange with the adjacent landmark Ernő Goldfinger designed Balfron Tower, the designation of the Blackwall Tunnel Approach reverts to the A102 through the Blackwall Tunnels and under The River Thames to Greenwich. The road continues south-east as Blackwall Tunnel Southern Approach with flyovers over Blackwall Lane (A2203) and Woolwich Road (A206) before it heads south and climbs the hill to the Sun-in-the-Sands interchange with Shooters Hill Road (A2/A207) where it ends a short distance to the south of the junction as the road becomes the A2 road which joins from the roundabout above.