The Department for Transport says its "disappointed" that 4,000 members of staff have decided to strike today.
The PCS union says members will hold 15 minute demonstrations across Wales.
We are disappointed that the PCS union have decided to take industrial action while we are still engaged in consultation with them about their concerns over changes within the department.
Contingency plans are in place to ensure delivery of essential services to the public continues throughout the planned strike action.
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Watch: It's 1959 and Queen Street in the city centre still has traffic running through it and there are 'trolley buses" on the roads.
It will be mainly dry with sunny spells, the best of which will be in the south and east.
Almost 1,500 drivers made claims against councils across Wales for damage caused to their vehicles by potholes in the last financial year.