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Highway manhole covers

Our Highway ironwork range is durable, reliable, simple to specify, easy to install and operate. They are available in both D400 and E600 load classifications.

Highway manhole covers are a triumph of engineering, practicality and simplicity. We know from talking to our customers that they value high quality products with straightforward ranges and support on hand to help select the right solution. Highway comes in a wide range of sizes and depths and has been thoughtfully designed and engineered to be the easiest range of manhole covers to specify and install on the market. The range exceeds the most demanding standards and guidelines from national highway authorities.

Highway D400 Manhole cover installed in road

> 1,500 Annual Average Daily Traffic (AADT)?

With the introduction of CD 534 there were several key changes. This includes the requirement for E600 manhole covers to be installed in place of D400 covers where the Annual Average Daily Traffic (AADT) of light goods vehicles travelled on a road is greater than 1,500 in each direction.

As a "rule of thumb", most A roads will have an annual average daily traffic number over 1,500 light goods vehicles. Full traffic data can be found for many locations around the UK on the Government website.

Product comparison

Find the right range for you

Our manhole cover comparison tool gives you a detailed overview of which features, options and accessories are available for each product range.

The tool provides information on our three primary iron ranges; Tristar, Highway and Unite, making it easy to find the best solution for your project.

Related case study

Aberdeen Western Peripheral Route (AWPR)

The Aberdeen Western Peripheral Route (AWPR) will provide a new strategic road link to improve travel in and around Aberdeen and the north east of Scotland. It will take through traffic out of the “Granite City”. Linking Stonehaven at its southern end with Tipperty at the north, the bypass had been built by the Connect Roads consortium, consisting of Balfour Beatty, Carillion and Galliford Try (Morrison Construction).

Transport Scotland /Aberdeen City and Aberdeenshire Councils
Transport Scotland /Aberdeen City and Aberdeenshire Councils
Read the full Case Study
Related case study

Years of exceptional performance

Our Highway D400 covers are still operating at full capacity after three and a half years of being subjected to high levels of HGV traffic. Meaning the organisation can focus solely on new work, rather than being distracted by manhole covers that have failed prematurely and need fixing or, in some cases, reinstalling.

Scottish Water
Scottish Water
Read the full Case Study