Bob, I lost a job a few years ago by suggesting the use of rigid pipe on the ug in front of a garage, the owner told me i was a jack a$$, the other EC told him there was nothing wrong with using PVC, and that i was an old time electrician that din't know any other way of doing the job.
This past march his wife came home from the local lemon aid stand at 2:00AM and drove into the PVC, his neighbor told me they heard a loud thud, and there was a bright flash, and then, they lost power.
Bob, i suggested not only using rigid, but also installing a curb or post.