The street I live on has unrestricted parking and is near shops and a train station - people often park on my street to avoid paying at nearby car parks for shoppers and station. If the spaces are full on my street, there is no other unrestricted parking for about half a mile.
I have a baby who hates travelling in the car seat. After a number of occasions when I've returned home in the car with a screaming baby to find nowhere to park, AIBU to start 'reserving' myself a parking space with my wheelie bin when I'm out in car for short periods?