Rural arterial road 5 km upgrade design.
Case study: civil road design and documentation for a 5 km rural arterial upgrade in central NSW — pavement design, geometry, drainage, intersection treatment and signage to Austroads and TfNSW Specifications.
Project overview
ASTCAD delivered civil design documentation for a 5 km arterial road upgrade in central NSW for a regional council. The scope included pavement reconstruction, geometric realignment of a tight bend, three intersection upgrades and full drainage replacement — all designed to Austroads and TfNSW specifications.
The challenge
The existing road had a non-compliant horizontal curve causing repeated heavy-vehicle rollovers. Realignment would impact a council-owned heritage stone wall and required environmental offset coordination. The drainage system was over capacity and contributed to recurring flooding of two adjacent properties.
Our approach
- 12d Model corridor design with full pavement and geometry
- Horizontal curve realignment minimising heritage stone wall impact
- Drainage design with capacity for Q100 and provision for upstream catchment
- Three intersection treatments — channelised, auxiliary lane and seagull
- Pavement design to Austroads AGPT04 with subgrade testing
Deliverables
- Detailed design drawings (62 sheets)
- Pavement design report per AGPT04
- Drainage design report and capacity analysis
- Signage and line-marking plans
- Construction specification and bill of quantities
Outcome
The upgrade was constructed in two stages over 8 months. Post-completion road audit confirmed elimination of the geometric hazard. The drainage upgrade resolved flooding incidents at both properties; no further insurance claims have been raised.