The Democrat, who has promised to curb New York's massive social inequality, was accused of presiding over the injustice of one set of traffic rules for him and another for ordinary people.
New York's local CBS news channel on Thursday filmed his official vehicle as it ran two stop signs, changed lanes without signalling and went over the speed limit.
Questioned by journalists today, de Blasio directed them to the police, who are responsible for his security.
"At certain times, under certain conditions, this training... May sometimes include tactics to safely keep two or more police vehicles together in formation when crossing intersections," it said in a statement.
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Just two days earlier an enthusiastic de Blasio had ordered a crackdown on dangerous driving designed to slash traffic deaths.
Not everyone was impressed.
"If Mr de Blasio were still the righteous public advocate, he would be calling this mayor out for endangering citizens and treating himself above the law," wrote New York Times editorialist Lawrence Downes.
Twenty pedestrians have been killed in traffic accidents in New York since the start of the year.