I have had a fellow driver ask how long these are good. I can honestly say I have never looked although I know it is part of the pre trip, guess Ill get fired now. If one has a date of say 1990's is it fair to say it should be replaced, or are they good forever? I have a brand new truck with all the bells and whistles, which was given to me last week, sooooo Im guessing, mine is fine, but as for a fellow driver I have no answer. Who should we contact, if it is out of date, mgmt, mechanic or safety committee? All replies will be much appreciated.