the dow jones transportation average just slipped into bear market territory that can mean bad news for the us economy and the us stock market the dow transportation average ticker djt is a list of about 20 airlines railroads and trucking stocks that some traders use to gauge the health of the overall economy if planes trains and road vehicles are all buzzing the economy must be fine that is the idea anyway and if the stocks tied to those things are struggling then it portends bad things for markets down the