qu ist , ▁Mc V ay ▁and ▁Hu ▁for ▁the ▁F D OT ▁in ▁ 2 0 0 7 . ▁ ▁P ile ▁Techn ician ▁P ile ▁Techn ician ▁was ▁developed ▁for ▁the ▁F D OT ▁to ▁provide ▁a ▁fast ▁and ▁efficient ▁manner ▁of ▁entering ▁P ile ▁data ▁to ▁calculate ▁payment ▁for ▁work ▁performed ▁by ▁the ▁contract or . ▁ ▁Atlas ▁A TL AS ▁is ▁an ▁analysis / design ▁program ▁which ▁is ▁used ▁for ▁the ▁analysis ▁and ▁design ▁of ▁signal ▁lights ▁and ▁signs ▁supported ▁by ▁the ▁dual ▁cable ▁system . ▁The ▁analysis ▁consists ▁of ▁an ▁iter ative ▁technique ▁which ▁is ▁a ▁combination ▁of ▁the ▁Force ▁D ens ity ▁Method ▁( F DM ) ▁and ▁the ▁Direct ▁St iff ness ▁Method ▁( DS M ). ▁The ▁F DM ▁is ▁ideal ▁for ▁the ▁analysis ▁of ▁cable ▁structures ▁whereas ▁the ▁D SM ▁is ▁the ▁most ▁widely ▁used ▁technique ▁for ▁the ▁analysis ▁of ▁fr amed ▁structures . ▁The ▁nature ▁of ▁the ▁structures ▁under ▁consideration ▁lead ▁to ▁the ▁development ▁of ▁this ▁analysis ▁technique ▁which ▁is ▁a ▁combination ▁of ▁the ▁two ▁methods . ▁A TL AS ▁handles ▁the ▁wind ▁loading ▁in ▁a ▁real istic ▁manner . ▁It ▁allows ▁the ▁user ▁to ▁specify ▁the ▁wind ▁speed ▁as ▁well ▁as ▁the ▁areas ▁of ▁the ▁signal ▁lights ▁or ▁signs , ▁parallel ▁to ▁the ▁X ▁and ▁Y ▁axis . ▁In ▁doing ▁so ▁the ▁program ▁calcul ates ▁the ▁applied ▁loads ▁on ▁the ▁corresponding ▁nod al ▁points ▁internally , ▁based ▁on ▁the ▁specified ▁element ▁areas ▁of ▁the ▁L IGHT ▁elements ▁in ▁each ▁plane . ▁The