Yorkshire ambulance workers struck for the fourth time on Monday of this week.
Monday’s five-hour walkout followed a five-hour strike on Friday of last week.
Workers also struck on 1 and 3 February.
The health workers, in the Unite union, are furious about plans to change their shift patterns.
This could see ambulance staff go ten hours without a break for food or rest.
Crews are already stretched to the limit.
Unite represents some 500 workers in Yorkshire ambulances.
Disgracefully the Yorkshire Ambulance Service NHS Trust derecognised the union after it raised concerns over patient safety.
The union wants a protected meal break of 30 minutes after six hours.
The Trust has also refused to meet with the union to discuss the dispute.