Workers at dozens of Driving and Vehicle Licensing Agency (DVLA) offices are staging a 24-hour strike in a dispute over closures and job losses at a number of sites across the country, potentially including several in East Anglia.
Among the offices facing closure are Chelmsford, Ipswich, Northampton, Norwich and Peterborough.
The DVLA said it could not guarantee a business-as-usual service because of the strike and asked people to avoid travelling to any DVLA office on Friday.
Members of the Public and Commercial Services union (PCS) at 39 local and 10 enforcement offices will take part in the industrial action. The union is campaigning against planned office closures across the country, arguing it signals the end of a "highly prized" face-to-face service to motorists.