The police were also eager to see motorists were not on drugs. They hope that the scale of the checks will serve as a deterrent.
Last summer 5% of motorists tested positive for alcohol. The figure is higher than rates measured during the Christmas holidays.
Christian De Coninck of Brussels police: "We hope that drivers when they know they face checks during the summer too won't drink-drive."
In Brussels 10% of drivers breathalysed were over the limit. 22 licences were withdrawn. Six drivers were on drugs. Checks were carried out at 9 spots across Brussels.
Across the country a total of 43 driving licences were withdrawn last night in Brussels. Eight people were detained because they were in possession of drugs, were driving a stolen car or didn't have an insurance or driving licence.
Last year 40% of all such checks were carried out during the weekends. The police want to increase the number of checks especially at night and during the weekends.