Driving test examiners, coastguards and other transport staff are to take strike action in the latest wave of action in protest at Government spending cuts, jobs and pensions.
The action will start on Friday in 39 Driver and Vehicle Licensing Agency offices, followed by a two hour walkout by driving examiners on June 8.
A week-long series of strikes in the Maritime and Coastguard Agency will also be held next month, said the Public and Commercial Services union.
Further strikes will be held throughout June by staff at the Department for Transport head office.
PCS general secretary Mark Serwotka said: "With unemployment high and our communities suffering as a result of the Government's cuts, ministers should be providing all the help they can to local economies that are crying out for support and investment.
"Instead they're ploughing on with entirely unnecessary and unpopular cuts to vital transport services. These strikes across the whole range of transport services form a major part of our ongoing fight against cuts to pensions, jobs and pay."