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Retroover bridge

A proven rapid build modular bridge and flyover system

Available for hire or sale, the Retro Over-bridge (ROB) is a pre-fabricated modular steel bridge system combined with pre-engineered intermediate supports and other specifically developed details to deliver a proven solution for inner city flyovers and other multi-span over-bridges.

Standard ROB units are 1.5m wide and can be placed side by side to form any bridge width required: 3m, 4.5m, 6m, 7.5m, 9m, etc.

Pre-assembled for rapid build, suitable for vehicles up to 45 tonnes GVW

The standard span module is 25m. Bridge units are pre-assembled for delivery by road and rapid erection and installation by crane at site.

Completed flyovers and over-bridges are suitable for use by public road going vehicles with a Gross Vehicle Weight of up to 45 tonnes.

The ROB system is designed using established in-house Retro Bridge design procedures to carry the lighter loading categories of many different international standards including HA loading to BD37/01 and HS20 loading to AASHTO.

Safe to use, re-locatable, suitable for temporary and permanent use

ROB units come with factory applied anti-skid surfacing as standard.

Completed over-bridges and flyovers are re-locatable with ease and are suitable for permanent and temporary use, providing much needed congestion relief and road diversion and bridge crossing capability for a variety of different applications.

Retro Over-bridges are ideal for temporary and permanent flyovers and over-bridges on public roads, private estates and construction sites alike.

We offer the complete service – design, supply, erection and dismantling

As with all of our bridge systems, we offer a full design, supply, erection and dismantling service, ensuring that Retro Over-bridges are built to the latest quality, health, safety and environmental standards.


design Loading and Design
- Eurocode based calculations, HA loading to BD37/01, or HS20 loading to AASHTO.
- Other international standards catered for.
- Suitable for loads of up to 45 tonnes Gross Vehicle Weight depending on span.
- Off-road construction traffic.
Spans, Widths and Depths
- Overall lengths in multiples of 25m clear spans.
- 1.5m standard unit widths.
- Standard roadway widths of 3m, 4.5m, 6m, 7.5m, 9m, etc.
- 0.98m deck depth.
Impact protection
- Parapets to edge of outer units.
Deck Surfacing
- Factory applied epoxy based anti- skid surfacing as standard.

Other Attributes
- Available for hire or sale.
- Temporary and permanent flyovers and over-bridges.
- Suitable for use on public roads and construction site accesses.
- Easy to transport to site, very quick and simple to build by crane.
- Simple, cost effective foundations.
- Pre-engineered intermediate support system.
- Rapid build, proven solution.