At a total value in excess of €500M, the M3 motorway was
SIAC's largest ever contract in Ireland as well as the biggest road project
awarded by the Irish National Roads Authority (NRA).
The project required the construction of 63km of motorway
and high-quality dual carriageway together with 61km of associated local
county and link roads. There were a total of 59 structures constructed (35
overbridges, 19 underpasses, 3 river bridges and 2 bridges over railways)
together with 39 structural culverts. Two of the river crossings were erected
across the River Boyne and the River Blackwater. The former was a
post-tensioned deck construction spanning some 250m..Two toll plazas were also
built as part of the scheme.
Total excavation – 5,078,000m3
Total fill requirement – 5,733,000m3.
Total bituminous material laid – 1,265,000 million tonnes
Total area of bridges – 47,000m2
Total fencing - 280km
Total drainage pipe work - 196 km
Landscaping -150,000 trees and shrubs were planted
throughout the entire route.