STRUCTURE /Zone_Data/
         
         INTEGER*2 index      ! zone index
         INTEGER*2 number     ! user zone number
         INTEGER*2 destnode   ! destination node (centroid) number
         INTEGER*2 destindex  ! destination index
         
         INTEGER   nreach(NU_ZN,0:1,0:1) ! # of tagged/info vehicles
                                         !   which have reached this
                                         !   zone from all other zones
         INTEGER   ngen(0:1,0:1,NU_ZN)   ! # of tagged/info vehicles
                                         !   generated from this zone
         REAL      tto(NU_ZN,0:1)        ! sum of travel times for all
                                         !   info/non-info vehicles
                                         !   which have reached this
                                         !   zone 
         
         REAL      demand(NU_ZN,MAX_DEMAND_INTERVALS) ! trip demand to
                                                      !   all zones from
                                                      !   this zone for
                                                      !   each interval
         REAL      cumdem(NU_ZN,MAX_DEMAND_INTERVALS) ! cumulative trip
                                                      !   demand to all
                                                      !   zones from
                                                      !   this zone for 
                                                      !   each interval
         REAL      totdem(MAX_DEMAND_INTERVALS)       ! total demand
                                                      !   from this zone
                                                      !   for each
                                                      !   interval
         REAL      totlmz       ! total lane miles in zone
         REAL      expgenz      ! total expected generation during the
                                !   current demand interval
         INTEGER*2 numgenlink   ! number of generation links
         INTEGER*2 genlink(MAX_GENERATION_LINKS) ! list of generation links
         
         REAL      famsplit(K_EQ) ! familiarity levels of drivers
                                  !   generated from this zone
         INTEGER   ifamz(3)       ! ??
         
         END STRUCTURE