close menu
Home About Capabilities Our Solutions News Our People Vacancies Contact

Parent Companies

Asset Management Network Operations Design & Construction Health, Safety & Environment Customer

Our capabilities

A-one+ is integrated in every aspect of highway engineering. You can depend on our capabilities and solutions to cover every eventuality. After working on thousands of miles of road networks, A-one+ is ready for any challenge.

Simply click on each to see the many different ways we  support your network.

Our Capabilities


Health, Safety & Environment

Design & Construction

Network Operations

Asset Management

Further information

About Us

A-one+ is the super group of integrated highway engineering providers, having been established by industry leaders CH2M, Colas and Costain.

Our Solutions

Our unique arrangement allows us to draw knowledge and expertise from within parent companies and fosters a collaborative approach; encouraging innovation and solving problems.


People have immense importance at every level of our company, all the way from trainees up to the executive management team and our parent companies.