▁software ▁architecture . ▁ ▁Field ▁hardware ▁such ▁as ▁intersection ▁controllers , ▁video ▁cam eras ▁and ▁speed ▁detect ors ▁are ▁connected ▁via ▁field ▁process ors ▁back ▁to ▁a ▁central ▁application ▁server . ▁ ▁Users ▁connect ▁to ▁the ▁application ▁server ▁via ▁the ▁work station ▁software . ▁ ▁Field ▁communic ations ▁are ▁via ▁Opt ical ▁F ib re , ▁D SL , ▁or ▁W ire less ▁connections . ▁ ▁The ▁software ▁is ▁built ▁in ▁distinct ▁modules ▁for ▁each ▁distinct ▁area ▁of ▁traffic ▁/ ▁transport ▁control ▁and ▁monitoring . ▁ ▁The ▁work station ▁software ▁communic ates ▁to ▁the ▁application ▁server ▁software ▁via ▁a ▁publish er ▁/ ▁subscri ber ▁model ▁( i . e . ▁work st ations ▁sub scribe ▁to ▁specifically ▁requested ▁streams ▁of ▁data ▁which ▁are ▁published ▁by ▁the ▁application ▁server ). ▁ ▁The ▁software ▁architecture ▁model ▁is ▁designed ▁to ▁support ▁the ▁software ' s ▁claim ▁of ▁being ▁an ▁" integr ated " ▁Advanced ▁Tra ffic ▁Management ▁System . ▁ ▁This ▁breaks ▁away ▁from ▁the ▁inter - oper ability ▁model , ▁which ▁is ▁multiple ▁I TS ▁systems ▁working ▁in ▁parallel , ▁each ▁performing ▁a ▁discrete ▁function . ▁ ▁The ▁work station ▁software ▁is ▁built ▁around ▁a ▁central ▁user ▁interface ▁called ▁" ST RE A MS ▁Explorer ". ▁ ▁Other ▁specification ▁/ ▁reporting ▁applications ▁can ▁all ▁be ▁launched ▁from ▁ST RE A MS ▁Explorer . ▁ ▁The ▁transport ▁network ▁data ▁is ▁set ▁up ▁via ▁a ▁G IS ▁( Ge ographic ▁Information ▁System ). ▁ ▁The ▁G IS ▁allows ▁for ▁a ▁graph ical ▁user ▁interface ▁displaying ▁transport ▁network