It is afternoon rush hour on the M4 and drivers are yet again making slow progress around the city of Newport, often seen as the gateway to south Wales given its location between Cardiff and Bristol. Cars and lorries are stuck in gridlocked traffic in both directions on the approach to the Brynglas tunnels, where the road narrows to two lanes in each direction, while flashing lights warn motorists in Welsh and English of a ciw ( queue). Traffic jams may be an everyday reality for commuters and businesses trying to move goods around, but they have also become a hotly debated topic before the Senedd elections on 7 May, in a vote predicted to bring sweeping political change to the principality, and send Labour into opposition for the first time since devolution in 1999. The Newport Transporter Bridge at dusk.…