Acorns are a tripping hazard? I have never been especially graceful, I have lived under oaks for about half the last thirty years--including at least four that were astonishingly productive of acorns, and bless me if I've ever tripped on an acorn.
It happens - my aunt broke her tailbone after slipping on acorns. I don't blame the city one bit. Oak trees are beautiful trees for forests and parks, but they are very messy for public walkways. They drop small branches constantly as well as piles of acorns that attract squirrels and mice.
