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Introducing integrated highway engineering provider A-one+.
We have the capabilities to design, construct and operate thousands of miles of road networks.
A-one+ works as one team delivering highway excellence.
Discover exactly what we do for your road network by viewing our capabilities and solutions now.

What we do

About Us

A-one+ is a key group of integrated highway engineering providers, having been established by industry leaders Jacobs, Colas and Costain.


You can depend on our capabilities to provide a quality integrated highway service and our solutions to develop pioneering industry innovation.


People are our most important asset. Being un-incorporated means that parent company expertise and support for our employees plays a vital role in our success.

We offer a wide range of services, click the button to find out more

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Our Solutions

A64 Carriageway Renewal Team

Ouse Bridge Safety Mock Up

Cusworth Park and Gardens Preservation

Integrated Area Programme

LATEST NEWS / 15.10.2021
Seven million hours

A-one+ exceeds landmark SEVEN million hours reportable injury free National Highways Area 12 Asset Support Contract in...

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LATEST NEWS / 18.02.2021
Smart Lighting

We've been working with supplier partner Holophane to install smart, energy efficient lighting on the M180 in Humberside. The...

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LATEST NEWS / 20.01.2021
Awards Finalists

A-one+ has been announced as finalists in two of the industry’s prestigious national awards with our Integrated Area Programme...

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LATEST NEWS / 08.01.2021
SIX million hours

 Our Area 12 team in Yorkshire and Humber has achieved an industry first by reaching a breakthrough figure of SIX million...

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