The motion was tabled by Labour, despite it cancelling a proposed relief road when it was in office.
Work is needed to stabilise 600 metres of embankment alongside the motorway in Wiltshire.
A judge tells Martin Stokes "you seem to think the laws of the road do not apply to you".
Seven years after the party axed the project, Labour says the Welsh government should build the road.
The decision to halt plans for the A350 bypass is described as "the definition of madness".
National Highways says that months of repair work - which begins later - will be "disruptive".
People in the city say the plans will have a "massive impact" on commuters.
It's a stretch of road that has been dubbed "the gateway between Wales and England".
Proposals from the Welsh government could see three junctions partially or totally shut.
