The number of lollipop men and women employed in the UK has been cut by more than 2,000 in the past decade, according to a new study.
The union used Freedom of Information legislation to ask councils across the UK how many school crossing patrol officers they employed in the last financial year compared to 2009-10.
The history: Love that lollipop
More figures: Could lollipop ladies become a thing of the past?
In 2009-10, there were 7,128 employed by councils across England, Scotland and Wales and by 2017-18 that had dropped to 5,047, said the union.
The West Midlands and the North West were the worst-hit regions, with drops of 386 and 378 respectively, while Wales had 250 fewer school crossing patrol officers, with Scotland losing 163, according to the GMB.
National officer Rehana Azam said: "Ten years of brutal Tory austerity have left scars right across our society, and now it's got to the point where our kids aren't even safe walking home from school.
"No parent wants to get the call that their child has been involved in an accident, but that's the risk councils are taking because they are so cash-strapped.
"Austerity is a choice but councils have been left with no choice but to make savings.
"Our public services need proper funding, so they can rebuild from the ruins left by a decade of savage cuts."