I'm in Stage 2 of adoption, and in a converation with my social worker about boundaries I mentioned that I would ensure a child was safe near a busy road by using a buggy, a carrier or reins if I wasn't confident the small child would hold my hand.
She said that the use of reins isn't recommended. I've seen loads of my friends using little backpacks with a lead on their 2-4 year olds when needed.
Are reins that bad? I had some in the 90's, and I've turned out fine. I know this isn't a barometer for all parenting choices, but still.