The 30-year-old and husband Christopher want the law changed to reduce speed limits in public and private housing estates to 20kph.
The legal speed limit is currently 50kph but local authorities have the option of imposing limits of 30kph in residential areas.
The Brennans launched the campaign after their six-year-old Jake was knocked down and killed was playing outside their Lintown Grove home in Co Kilkenny last June 12 at 6.25pm – the time tomorrow the couple and their friends will end their three-day vigil outside the gates of the Dail.
Earlier this week, she told the Irish Times: ’I heard a loud bang and I saw him being flung-up in the air.
‘I ran over and he collapsed in my arms.
‘He was telling me, “mammy, I don’t want to die”.’
Although she has met Minister Donohue five times during her campaign, she decided to take the campaign to the gates of the Dail because she felt she was getting fobbed off.
She says she has previously been told it would ‘take many years’ for the speed limits on residential estates to be reduced to a mandatory 20kph.
The petition is on Change.org.