Gardai in Co Louth stopped a car speeding at 158km/h with a toddler "not properly restrained" inside.
Officers from Drogheda came across the vehicle on the M1 motorway.
Gardai also said the driver was on a learner permit and driving unaccompanied.
The motorist was also failing to display L plates.
A garda spokesman said: "Drogheda RPU stopped the above vehicle for going 158km per hour on the M1 in Charleville, Co Louth.
"The driver was on a learner permit and was driving unaccompanied, had no L plates displayed and also had a child under 3 not properly restrained.
"Proceedings to be commenced."
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