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M4 Junction 33 Capel Llanilltern roundabout

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We have upgraded the M4 J33 Capel Llanilltern Roundabout to improve capacity.

This project involved:

  • providing a dedicated left turn lane between the westbound exit slip road and the southbound carriageway of the A4232
  • replacement of the concrete carriageway on the slip road near  the junction.  

This has improved the capacity of the junction, easing delays due to queues, and so improving journey times and increasing journey time reliability.