Technical approval for structures
Technical approval is required for all new and existing structures with potential highway implications whether or not they are eventually intended to be adopted by the County Council. The process relates to design, construction, assessment, alteration, strengthening and repair.
The purpose of the technical approval process is to ensure that all structures are safe, durable, and in the case of structures proposed for adoption, are designed to require minimal maintenance.
The type of structures include bridges, tunnels, subways, culverts, retaining walls, reinforced earth structures, gantries, pipe bridges, buried corrugated steel structures and temporary structures; however, this list is not exhaustive and, if in doubt, the County Council as the Technical Approval Authority (TAA) should be consulted to determine applicability.
Applying for technical approval
Please read our design guide before applying.
It is recommended that the developer or designer should consult us regarding proposals at an early stage to ensure that all requirements are identified to enable the proposals to be fully considered. Initial contact should be made to the Highway Structures Approvals Mailbox.
Initial submissions for the technical approval of highway structures must be accompanied by:
- a request for a technical approval form
- a location plan with grid reference
- a general arrangement drawing showing the engineering structure proposed.
After this process, we will consider the proposals, give an initial response to the submission and assign it to one of the four checking categories contained within BD2.
After initial submissions, a formal submission must be submitted to include:
- an approval in principle pro forma – where required depending on the checking category assigned at the initial stage (example pro forma available here). This must be prepared to BD2/12 or its successor documents and include:
- relevant parts of the geotechnical design report
- documents relating to consultation
- The relevant design and check certificate:
The A.I.P. and design and check certificates are to contain details of the imposed loading agreed with the Technical Approval Authority and shall clearly state that designs have been carried out to the appropriate load models and special vehicles as detailed in BS EN 1991-2:2003 and agreed with the TA quoting the types. Similarly where retaining walls are concerned, quoting the agreed surcharge and accidental wheel load that has been agreed with the Technical Approval authority.
The above and any accompanying information should be sent electronically to the Highway Structures Approvals Mailbox.
Applications will be responded to within a target of two weeks following receipt of the submission.
Construction work must not proceed without the approval of the County Council as Technical Approval Authority.
We will carry out site inspections as necessary during the construction and prior to the handover to the end user whether the structure is to be adopted by the Authority or not. The level and approximate number of inspections required on site will be advised when the written design and check certificates are accepted and returned at the end of the formal submission stage.
Where it has been agreed that the structure will be adopted a full maintenance manual and health and a safety file with as-built drawings will be required to close the approval process.