Cars and corners.!
What I find extremely annoying are people who insist on parking their car on a corner whilst also half up the pathway. This happens regularly.
This makes it difficult for anyone on mobility scooters, using wheelchairs or mums with buggys.
I have also been under the impression this is illegal, as is parking too close to a corner. It was when I passed my driving test after reading the highway code, though lots of years ago !!!