Genuinely not sure if IABU.
Was at the playground earlier with 21 month old dd. She was toddling around between play equipment. There was a, I guess, 4 year old on a bike. He was pretty fast and at one point almost ran into dd. I was with her but about 6 foot behind. Obviously at 21 months she was oblivious. It was close enough for both me and his mum to call out.
I didn’t say anything but when chatting to DH later we thought it wasn’t the place for riding a bike with lots of toddlers running around. Surely the place for the bike is the actual park, not the playground?