paver
someone who works for a business
An employee
Those are called "driveway cul-de-sacs" or "hammerhead turns." They are used to help vehicles turn around safely and efficiently when exiting a driveway onto a main road.
A gardener.
a horticulturalist
demonologist
collector
Mason
coach
You can if you have permission from the driveway owner.
A person who works with gold is called a goldsmith.
Chemist