When I put my culvert in I was required to get a permit from TxDOT (TX dept of trans). They came out measured the ditch depth, and said I must have 18" pipe with "safty ends". 2 foot ditch with 18" pipe and 6" dirt on top. They had some rules about radius of the driveway and width for private/commercial. They did a great diagram and that is one permit I am glad I got. The old timers told me they use to put them in, but not these days.
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Amen on this subject. I too just did the same thing. My problem was I didn't ask permission from God (DOT) first. I found out the day after I rocked it in. They made me pull it all out and start over, with a permit first. Did they m,ake you put the concrete on the sloped ends? What county are you in?