Queens parents say they were told they had to start showing up at the bus stop a half hour earlier.
Schools Chancellor Dennis Walcott said he expects all buses to be back on the road Wednesday.
Local 1181 President Michael Cordiello said the city is unnecessarily prolonging the strike.
School bus drivers are planning to begin picketing Wednesday morning.
The bus drivers' union is planning to strike on Wednesday.
Union leaders accused the Bloomberg administration of putting cost-saving ahead of bus driver quality.
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