Environment and Infrastructure had brought 10 statutory instruments, with extensions listed to 25mph limits near local centres and main centre outer areas.
Under normal circumstances these are not debated and simply listed as work that has been undertaken.
The only way to overturn them is by annulment, and this was proposed by Deputy Carl Meerveld.
President Deputy Barry Brehaut said that by making some of the designated roads safer, more people could be encouraged to walk or cycle.
Proposing the annulment, Deputy Meerveld said that his concern was the lack of evidence behind the committee's changes and the blanket approach being taken.
Seconder Deputy Jeremy Smithies said the approach taken by E&I was lazy: 'It's my belief we should send E&I back to rethink this policy and come back to the States with a well-thought-out and evidenced policy letter,' he said.
Following more than two hours of debate the annulment was put to the vote and rejected by 28 votes to six with three abstentions. The statutory instruments were therefore accepted.
Among the roads affected are Glategny Esplanade, Braye Road, Le Friquet and Sandy Hook, as well as others that are close to main centres and an area around Blanchelande College.
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