M32 motorway 75,000 vehicles. Despite this, the M32 is frequently congested as it is a popular route into the centre of Bristol. During the morning rush hour, queues can tail back onto the motorway from the city centre. In 2014, the Highways Agency reported that the M32 between junctions 1 and 2 was the most unreliable motorway journey along the entire M4 corridor between London and South Wales, with over 56 per cent of journeys taking longer than predicted. The problem is exacerbated whenever there is an incident on the M4 around Bristol, as drivers attempt to use the M32 as a
M4 relief road and narrows to a restricted two-lane section through the Brynglas Tunnels, where heavy congestion occurs at peak hours. A variable speed limit is in place between junctions 24 and 28. M4 sliproads at Junction 25 (Caerleon Road) are diverted to reduce traffic through the tunnels. M4 Westbound traffic joining at Junction 25 is diverted via Junction 25A/A4042 (Heidenheim Drive)/A4051 (Malpas Road) to Junction 26. Similarly eastbound traffic wishing to exit at Junction 25 is diverted from Junction 26 via the A4051/A4042/Junction 25A. This adds to congestion on Malpas Road and other local roads near Newport city centre at peak times.