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Blanchardstown Interchange

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Blanchardstown Interchange
Location Map ( geo)
IMG 6847.JPG
View of the M50 from the Canal Bridge at night
Cameraicon.png View gallery (27)
Highway Authority
Transport Infrastructure Ireland
Junction Type
Opening Date
1990 (rebuilt 2010)
Roads Joined
M50, N3, R147, R806
Junctions related to the R147

Blanchardstown Interchange is junction 1 of the N3 and junction 6 of the M50. It is well-known for its elaborate road layout, with several flyovers.

The modern junction actually consists of three former junctions. The main Blanchardstown Interchange was opened in 1990 to serve the West-Link Bridge. The M50 was extended north of here in December 1996. This junction was built as a standard roundabout interchange, straddling the Royal Canal and the Sligo railway.

The N3 had two much smaller roundabouts as it approached this one. Blanchardstown Roundabout to the west (widely known as 'Scott's Roundabout' at the time) was the junction between the Blanchardstown Bypass and the old Main Street through Blanchardstown Village. It later provided access to Connolly Hospital. The flyover that replaced it is officially recorded as 'Scott's Junction'.

To the east, Auburn Avenue Roundabout provided access to Auburn Avenue and Dunsink Lane, serving Castleknock.

The roundabouts became unworkable as traffic levels rose not just on the M50 and the N3, but also in the rapidly-expanding suburbs around Blanchardstown, including the large shopping centre. The redesign, completed in 2010, effectively merged these three junctions into one.

Despite the new road layout, the junction does still suffer from congestion, primarily due to the poor alignment of some of the underpasses. A mandatory 30km/h speed limit applies to some of them, including one ramp that is colloquially known as "the corkscrew", for its sharp turns.

In 2012, the N3 into Dublin was downgraded to R147. The shortened N3 now starts here.

The original plan for the M50 showed no junction here, with the Navan Road crossing the M50 without an interchange. Instead the M4 would have had an interchange with the M50 close to here, at Castleknock.

Either side of the roundabout are two bridges of the canal. Talbot Bridge to the west is now a cul-de-sac, while Ranelagh Bridge to the east now acts as a pedestrian crossing.



Route To Notes


O Thuaidh/NORTHBOUND, Aerfort Átha Cliath/DUBLIN AIRPORT, Calafort Átha Cliath/DUBLIN PORT




Beal Átha Seanaidh/BALLYSHANNON, An Uaimh/NAVAN 38km, Baile Bhlainseir/BLANCHARDSTOWN 1km, An Cabhan/CAVAN, An Larionad B. Bhlainseir/THE BLANCHARDSTOWN CENTRE


An Lar/CITY CENTRE, Caislean Cnuce/CASTLEKNOCK Former N3.





Blanchardstown Interchange
Related Pictures
View gallery (27)
M50 Final Proposal - Coppermine - 18849.jpgN3 New Interchange Photomontage - Coppermine - 13438.jpgM50 Northbound, approaching J6 - Coppermine - 11937.JPGM50 Northbound, approaching J6 - Coppermine - 11938.JPGM50 works - Coppermine - 20017.JPG
Junctions on the M50
City  • 2 Coolock  • 3 Turnapin  • 4 Ballymun  • 5 Finglas  • 6 Blanchardstown  • 7 Palmerstown  • 9 Red Cow  • 10 Ballymount  • 11 Tallaght  • 12 Scholarstown  • Ballycullen • 13 Ballinteer  • 14 Sandyford  • 15 Carrickmines  • 16 Laughanstown  • 17 Junction 17
Junctions on the M3 and N3
Ashtown Roundabout • Auburn Avenue Roundabout • 1 Blanchardstown • Blanchardstown Roundabout • 2 Snugborough Road Interchange • 3 Clonsilla • 4 Clonee • 5 Pace • 6 Dunshauglin • 7 Blundelstown • 8 Kilcarn • 9 Athboy Road • 10 Kilmainham • 11 Kells • Staghall Roundabout • Belleek Road Roundabout
Crossings of the Royal Canal
Blanchardstown Interchange • Reilly Bridge • Ratoath Road Bridge • Broom Bridge • Cross Guns Bridge • Binns Bridge • Bloody Sunday Bridge • Clarke's Bridge • Newcomen Bridge • Sheriff Street Upper Bridge • Spencer Dock Bridge • Scherzer Lifting Bridge

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