JGL Corporate brochure - Flipbook - Page 54
06.
Case studies, our projects
A9, TAY CROSSING TO
BALLINLUIG, UNDERGROUND
CROSSING WORKS
Overcoming numerous challenges to a successful
project delivery with our award-winning, valuedriven approach and expertise.
Client:
Transport Scotland
Sector:
Rail infrastructure
Project duration:
February 2025 - ongoing
Project overview
As part of Transport Scotland’s A9 Dualling Programme, the section of the A9
trunk road between Tay Crossing and Ballinluig is being upgraded from a single
carriageway to a dual carriageway.
The scheme forms part of a wider strategic infrastructure improvement aimed
at increasing road capacity, improving safety, and enhancing journey reliability
between Perth and Inverness.
A key element of the project involves the design and construction of surface
water drainage infrastructure to collect, treat, and safely discharge runoff from
the proposed dual carriageway. The drainage strategy includes the provision
of a Sustainable Drainage System (SuDS) basin, located to the west of the A9, to
treat and attenuate surface water runoff prior to discharge.
Surface water from the carriageway is conveyed via a series of drainage pipes
from the SuDS basin towards the River Tay, which serves as the final outfall.
However, the presence of the Highland Main Line railway (Perth–Inverness)
presents a significant constraint, requiring the drainage to cross beneath the
live railway corridor.
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Joseph Gallagher Group | CORPORATE PORTFOLIO | 2026
