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Fire crews were called out to two blazes during last night's strike.
In the first, in Tudor Avenue a fence was set alight in a rear garden when a bonfire got out of control.
It was put out by crews with hoses in around 20 minutes.
The second, which also happened at around 6.45pm, saw a fire engine scrambled to the M20 where a coach was alight.
The driver had already extinguished it by the time the crew arrived, and firefighters left shortly after.
It happened in the London-bound carriageway between J8 at Leeds and J9 for Ashford.
The strike happened between 5pm and 7pm and was part of an eight-day strike in a dispute about pensions.
Kent Fire and Rescue Service has made "contingency plans", but is urging the public to be extra cautious to avoid fires or emergencies.