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National Highways Adds Wildlife Ledges to A421 Culverts

8/3/2026

Summary

Story summary

National Highways installed ledges in culverts beneath the A421 between Black Cat roundabout (Bedfordshire) and Caxton Gibbet roundabout (Cambridgeshire).
The ledges let hedgehogs, rabbits, mice, voles and badgers cross safely, project manager Paul Salmon said.
The 10-mile (16 km) upgrade will replace the carriageway between M1 near Milton Keynes and Harwich-Felixstowe route, ease congestion for about 80,000 users of Black Cat roundabout, and open in Spring 2027.

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Story summary

National Highways installed ledges in culverts beneath the A421 between Black Cat roundabout (Bedfordshire) and Caxton Gibbet roundabout (Cambridgeshire).
The ledges let hedgehogs, rabbits, mice, voles and badgers cross safely, project manager Paul Salmon said.
The 10-mile (16 km) upgrade will replace the carriageway between M1 near Milton Keynes and Harwich-Felixstowe route, ease congestion for about 80,000 users of Black Cat roundabout, and open in Spring 2027.