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Patcham Interchange

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Patcham Interchange
Location Map ( geo)
A27 ( westbound ) - Coppermine - 8430.jpg
A27 heading westbound to Patcham Interchange
Cameraicon.png View gallery (5)
Highway Authority
National Highways • Brighton and Hove
Junction Type
Dumbbell with freeflow links
Roads Joined
A23, A27

The Patcham Interchange forms the junction of two of the south coast's most important routes, the A27 and the A23.

It was built in the mid-1990s as part of the A27 Brighton and Hove bypass. The design of this junction is somewhat unusual due to the tight geographical constraints within which is resides, as well as the history of the area. It consists of a typical dumbbell above the A27, with a D3 spur heading down to the Mill Road Roundabout on the A23. Additionally there is a free-flow slip from the A27 eastbound to A23 northbound. Heading in the opposite direction (A23 S to A27 W) is also free flow, but via a left hand turn bypass of the two roundabouts. Both these movements also offer lane gains/drops to both roads.

The Mill Road Crossroads pre-dates the junction, providing access to Mill Road and Vale Avenue from the A23 London Road. London Road attracted a number of houses, some of which were demolished by the bypass. Braypool Lane was built to serve the remains of these. The crossroads is now a roundabout, with new link road plugged into it and replacing Vale Avenue.

National Cycle Network route 2 passes through the junction on its western side, it is grade separated from the A27, however does have to cross over Mill Road and the A23 (Single carriageway) when heading southbound.

Strip Maps

Current Layout


Pre 1930s

The A23 heads north to south as a single carriageway we a few properties along its course. There is a crossroads, however its only access roads which cross over the A23.


Slowly there has been development in the near area, the roads that once came through the crossroads are now used to gain access to residential areas to the East and link up to the Dyke Road to the West


Due to the A27 being rerouted along a new bypass a new junction needed to be constructed to handle traffic coming off and on the A27 to the A23. Due to restrictions with residential areas, terrain, railways and being at the time in an area of outstanding natural beauty (becoming national park in 2010) has resulted in a very odd design. The crossroads has been replaced with a roundabout, however the Eastern arm now takes you to a D3 and not a local residential road. The Western Arm still takes you along Mill Road which runs parallel with the A27, sometimes this is quicker than using normal entry onto the A27 There is still access to local roads by taking the 3rd lane in the D3. Heading southbound down the roundabout there is 3 lanes, becoming 4 just before the roundabout. Leaving the roundabout there are 2 lanes, with a third being added once a slip joins from the A27


The A27 usually is not subjected to queues here, due to the through route being grade separated, however at peak times the D3 link between the A23 and A27 is often congested which results in traffic backing up onto the A23 southbound. Improvements could be made to the dumbbell roundabouts, however free flow slips roads for A23 southbound traffic is needed to fix the issues.

As part of Highways England Expressways plans, the A23 and A27 were highlighted due to their existing motorway alike characteristics. If these roads are going to become expressways then freeflow links would be required between the A23 (to the north) and the A27 in both directions, this is possible but would impact on the national park as well as demolishing some properties.


Route To Notes


London, Crawley, Gatwick Airport




Worthing, Hove


Lewes, Newhaven, Universities
Mill Road 4.1m/13'6" height limit


Westdean, Hove, Portslade, Shoreham (A27), Chichester (A27) Mill Road 4.1m/13'6" height limit


Pyecombe, Crawley, London via Mill road


Brighton Along A23


Patcham Interchange
Related Pictures
View gallery (5)
Patcham Interchange.PNGA23 Patcham southbound.jpgA27 - Coppermine - 2126.JPGA27 ( westbound ) - Coppermine - 8429.jpgA27 ( westbound ) - Coppermine - 8430.jpg
Pevensey to LewesPevensey Roundabout • Golden Jubilee Roundabout • Cop Hall Roundabout • Eastbourne Road Junction • Berwick Roundabout • Beddingham Roundabout
Lewes to LancingSoutherham Roundabout • Ashcombe Roundabout • Falmer Interchange • Coldean Interchange • Hollingbury Interchange • Patcham Interchange • Devils Dyke Interchange • Hangleton Interchange • Holmbush Interchange • Adur Interchange • Sussex Pad
Lancing to ClaphamLancing Manor Roundabout • East Worthing Crossroads • Grove Lodge Roundabout • Offington Corner
Clapham to ChichesterClapham Interchange • Poling Corner • Crossbush Junction • Causeway Roundabout • Ford Roundabout • Danes Crossroads • Fontwell East Roundabout • Fontwell West Roundabout • Boxgrove Roundabout • Templebar Interchange
Chichester By-passResort Hotel Roundabout • Portfield Roundabout • Oving Crossroads • Bognor Road Roundabout • Whyke Roundabout • Stockbridge Roundabout • Fishbourne Roundabout
Incomplete M27Warblington Interchange • Langstone Interchange • Bedhampton Roundabout • Broadmarsh Interchange • Farlington Interchange • Port Solent Interchange
M27 J12 - M27 J11Paulsgrove Interchange • Castle Street Roundabout • West Street Roundabout • Cornaway Lane Roundabout • Condor Avenue Roundabout • Delme Roundabout • Wallington Interchange
M27 J11 - M27 J9Quay Street Roundabout • Station Roundabout • Titchfield Gyratory • Mill Lane Junction • St. Margarets Roundabout • Segensworth Roundabout • Park Gate Interchange
Junctions on the M23 and A23
A23 LondonKennington Oval • Streatham One-Way System • Thornton Heath Pond • Lombard Roundabout • Fiveways Corner • Purley Cross • Brighton Road Roundabout • Hooley
non primary A23Hooley • Lombard Roundabout • The Stations Roundabout • Belfry Roundabout • Longbridge Roundabout • Airport Way Roundabout West • Beehive Ring Road Junction • Gatwick Road Roundabout • Lowfield Heath Roundabout • Fleming Way Roundabout • Manor Royal Junction • Tushmore Gyratory • Ifield Roundabout • Ewhurst Roundabout • Gossops Green Junction • Cheals Roundabout • Southgate Roundabout • Pease Pottage Interchange
M23Unbuilt: 1 Tooting Bec/Streatham •  2 Streatham Vale • 3 Mitcham • 4 Beddington • 5 Wallington • 6 Woodmansterne   Built: 7 Hooley • 8 Merstham • 9 Gatwick • 10 Crawley • 10A Balcombe Road • 11 Pease Pottage
Airport WayAirport Way Roundabout West • 9a Airport Way Roundabout East • 9 Gatwick Interchange
A23 Sussex11 Pease Pottage • Handcross • Slaugham • Warninglid • Bolney Park Farm • Bolney • Hickstead • Sayers Common • Albourne Junctions • Hurstpierpoint • Newtimber • Quarry Junction • Dale Hill • Pyecombe • Patcham • Mill Road Roundabout
A23 BrightonMill Road Roundabout • Carden Avenue Roundabout • Crown and Anchor Junction • Preston Park South Junction • Beaconsfield Crossroads • Preston Circus • Ditchling Road Crossroad • Open Market • St Peters Church • Richmond Parade • North Road • Pavilion Parade • Old Steine • Grand Junction (Aquarium Junction)
Junctions on A roads in Brighton and Hove
A23 (In Brighton)Mill Road Roundabout • Carden Avenue Roundabout • Crown and Anchor Junction • Preston Park South Junction • Beaconsfield Crossroads • Preston Circus • Ditchling Road Crossroad • Open Market • St Peters Church • Richmond Parade • North Road • Pavilion Parade • Old Steine • Grand Junction (Aquarium Junction)
A27 (In Brighton)Coldean Interchange • Hollingbury Interchange • Patcham Interchange • Devils Dyke Interchange • Hangleton Interchange
A259 (In Brighton)[[]] • [[]] • [[]] • [[]] • [[]] • [[]] • [[]] • [[]]
A270Coldean Interchange • Coldean Lane Junction • Moulsecoomb Way Junction • Bevendean Junction • Vogue Gyratory • St Peters Church • Preston Circus • Old Shoreham Road Junction • BHASVIC Crossroads • The Drive Junction • Nevill Crossroads • Hangleton Road Crossroads • Benfield Valley Junction • Southern Cross • Windmill Parade • Kingston Lane Junction • Holmbush Interchange
A293[[]] • [[]] • [[]] • [[]] • [[]] • [[]] • [[]] • [[]]
A2010BHASVIC Crossroads • Seven Dials • Surrey Street Gyratory • Clock Tower • West Street Junction
A2023[[]] • [[]] • [[]] • [[]] • [[]] • [[]] • [[]] • [[]]
A2038[[]] • [[]] • [[]] • [[]] • [[]] • [[]] • [[]] • [[]]

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