I too have noticed the old U-channel sign posts being replaced with PSST posts on many Minnesota highways. And Sign post up ahead, 25 years of 'Ask Us' answers | Local News | mankatofreepress.com ...

But the reader is correct about MnDOT cutting many of its sign posts by 50%. “For more than 50 years, MnDOT had traditionally installed nearly every one of its signs on at least two U-channel ...