Flags on oversized loads

I'm curious, has the law been changed that we no longer need flags on oversized loads? This past week I saw 3 separate oversized loads with no flags on them. Two of them only had the signs on the front and back and the third had signs and strobes but no flags. Maybe it was just a coincidence but 2 of the three looked like 'professional' type haulers which made me wonder if the laws had changed and I hadn't heard about it yet.

Flags on oversized loads