Whatever initially occurred between the two drivers, it's hard to watch. East Texas is typically known for mannerly behavior--relatively speaking, at least.
There are some things that we don't think about during storms. Luckily, organizations like TxDOT DO think about such things, and they're there to remind us.
This is catching on everywhere, and we'll be seeing more of it in 2019. Fake police officers like "Constable Scarecrow," that are cardboard cutouts made to look like real officers with radar guns.