National Highways has reiterated its commitment to improving around 250 sites where road runoff provides a high risk of polluting the environment, despite a lower target in the Road Investment Strategy (RIS 3) and advice from its regulator that it should come clean about what can really be afforded.
As I wrote here, although the company’s 2030 Water Quality Plan sets that date to mitigate all confirmed high-risk outfalls and soakaways, the commitment in the new RIS is to mitigate 190–250 high risk sites, implicitly by 2031.
This is subject to “reviewing a deliverability plan by the end of 2027/28” and “includes those outfalls and soakaways mitigated during Road Period 2 and 2025/26”.

As defined by the bottom of the range, the RIS pledge is significantly less ambitious than the 2030 plan but higher than what the company said it could afford, as quoted in its regulator’s November 2025 advice on its draft business plan:
National Highways estimates that between 110 and 130 mitigated assets will be delivered from the allocated budget as part of this programme in RP3.
However, appearing before the Transport Committee on Wednesday, chief operating officer Duncan Smith said:
We’re very pleased to say that we’ve been given funding in RIS 3 to mitigate those locations where they have the highest potential risk to the environment. So it’s not saying they are polluting, but based on the receiving watercourse and some of the topography and dynamics of the road that they are supporting, those are ones that are the highest priority for us to invest in. And we think that by 2030, we will have improved around 250 of those locations to ensure that the receiving waterourses are protected.
I asked National Highways whether this meant that it was sticking to the 2030 plan. A spokesperson referenced the plan and said the company estimated that by the end of 2030 it will have mitigated around 250 sites, adding:









