** KeyBanc says the ongoing labor constraints will hit the
growth of the U.S. trucking industry, downgrading Werner
Enterprises WERN.O and Marten Transport MRTN.O to "sector
weight" from "overweight"
** "With truckload industry employment decoupling from
increasing wages, we now expect labor constraints to limit
earnings upside despite favorable pricing dynamics" - KeyBanc
** Along with potential cost inflation, the most prevalent
risks currently facing WERN and MRTN include the cyclical and
economically sensitive nature of trucking demand - brokerage
** Brokerage, however, maintains positive stance on JB Hunt
Transport Services JBHT.O , Schneider National SNDR.N , and
Hub Group HUBG.O , saying their growth is not restricted by
labor availability to the same extent as the rest of the market
(Reporting by Tapanjana Rudra)