Appendix Table A.1
Detailed Definition of Variables used in BAYCAST Travel Demand Models
(in alphabetical sort order)
| Variable Name |
Model(s) |
Definition |
| AreaDeni |
NHBMC |
Area Density, zone of production, ((TOTPOP + 2.5 * TOTEMP) / (CIACRE + RESACRE)) |
| Auto Distance |
HBWDT |
Door-to-Door Drive Alone Peak Period Distance, in miles |
| Auto Distance^2 |
HBWDT |
Door-to-Door Drive Alone Peak Period Distance, in miles, squared |
| Berkeleyi |
HBCOLM |
Berkeley zones, zone of production (zones=718-722, 725-738, 741-747) |
| Berkeleyj |
multiple |
Berkeley zones, zone of attraction (zones=718-722, 725-738, 741-747) |
| Bike Time |
HBCOLM |
Bicycle travel time, in minutes |
| Bridge Dummy |
HBWDT |
Bridge crossing dummy variable (if Drive Alone Toll > 0.0, then Dummy=1) |
| CIACRE |
multiple |
Commercial + Industrial Acres (ABAG Land Use) |
| Constant |
multiple |
Modal or Utility intercept. |
| Corej |
multiple |
Core zone of work (see Table A.2 for definition of CORE) |
| Cost |
multiple |
Trip Cost in 1990 cents (per person) |
| CTFT |
HBWDT |
Congested Time less Free-Flow Time, in minutes |
| GPOPD-Leg 1 |
WHHAO |
Gross Population Density (TOTPOP/TOTACRE), MIN(10.0,GPOPD) |
| GPOPD-Leg 2 |
WHHAO |
Gross Population Density (TOTPOP/TOTACRE), MAX(0,MIN((GPOPD-10.0),20.0)) |
| GPOPD-Leg 3 |
WHHAO |
Gross Population Density (TOTPOP/TOTACRE), MAX(GPOPD-30.0) |
| HH Income |
HBWDT |
Household Income in 1989 constant dollars (not divided by 1000) |
| HH Size |
WHHAO |
Persons per Household (same as Pers/HH) |
| HHINC |
multiple |
Income in 1000s of 1989 dollars (same as Income) |
| Income |
HBSRMC |
Household Income in 1000s of 1990 dollars. |
| Income-Leg 1 |
multiple |
Income in 1989 dollars. MIN(Income,25000) |
| Income-Leg 2 |
multiple |
Income in 1989 dollars. MAX(0,MIN(Income-25000),50000)) |
| IVTT |
multiple |
In-Vehicle Travel Time |
| Ln Net ResDensI |
HBCOLM |
Natural Log of Net Residential Density, zone of residence, Ln(TOTHH/RESACRE) |
| LnAreaDeni |
HBSHMC |
Natural Log of Area Density, Zone of Residence (see Table A.2) |
| LnCost |
multiple |
Natural Log of Trip Cost in 1990 cents (per person) |
| LnEmpDi |
HBWMC |
Natural Log of Gross Employment Density, Zone of Residence, Ln(TOTEMP/TOTACRE) |
| LnEmpDj |
HBWMC |
Natural Log of Gross Employment Density, Zone of Work, Ln(TOTEMP/TOTACRE) |
| LnIncome |
HBSRMC |
Natural Log of Household Income in 1000s of 1990 dollars. |
| LnPHH |
HBSHMC |
Natural Log of Household Size |
| MFDU |
WHHAO |
Multi-Family Dwelling Unit Dummy Variable |
| Multi-Wrkr/HH |
HBWMC |
Multiple Number of Workers in Household Dummy Variable |
| Net ResDensI |
HBHSM |
Net Residential Density, Zone of Residence, (TOTHH/RESACRE) |
| No VHH |
HBWMC |
No Vehicle in Household Dummy Variable |
| OVTT |
multiple |
Out-of-Vehicle Travel Time |
| PaloAltoi |
HBCOLM |
Palo Alto zones, zone of production (zones=234-238, 245-248, 254-258) |
| PaloAltoj |
multiple |
Palo Alto zones, zone of attraction (zones=234-238, 245-248, 254-258) |
| Pers/HH |
multiple |
Persons per Household (same as PHH) |
| PHH |
multiple |
Persons per Household (same as Pers/HH) |
| PHH^3 |
HBGSM |
Persons per Household, cubed (polynomial transformation) |
| RESACRE |
multiple |
Residential Acres (ABAG Land Use) |
| Retail Industry |
HBWDT |
Retail Industry worker Dummy Variable |
| Rurali |
HBGSM |
Rural zone of residence (see AREATYPE, Table A.2) |
| SFOBB WB |
HBWDT |
Bay Bridge Westbound Dummy Variable (based on origin & destination zones) |
| SHPOP62+ |
WHHAO |
Share of Population Age 62+ |
| Single VHH |
HBWMC |
Single Vehicle in Household Dummy Variable |
| SR Dummy |
HBWDT |
Shared Ride 2+ choice, dummy variable |
| Stanfordi |
HBCOLM |
Stanford zones, zone of production (zones=244, 249-252) |
| Stanfordj |
multiple |
Stanford zones, zone of attraction (zones=244, 249-252) |
| Theta(Group) |
multiple |
Nesting, or Scaling Parameter for Group submode choice nested logit |
| Theta(Motor) |
multiple |
Nesting, or Scaling Parameter for Motorized submode choice nested logit |
| Theta(Transit) |
HBWMC |
Nesting, or Scaling Parameter for Transit submode choice nested logit |
| Time (Total) |
HBSHMC |
Total Travel Time, in minutes |
| TOTACRE |
multiple |
Total Acres (ABAG Land Use) |
| Veh/HH |
multiple |
Vehicles Available per Household (same as VHH) |
| VHH |
multiple |
Vehicles Available per Household (same as Veh/HH) |
| Wait |
multiple |
Transit wait time, in minutes |
| Walk |
multiple |
Walk time, in minutes (may include walk-only utility walk time) |
| Wrkr/HH |
HBWMC |
Workers in Household (same as WHH) |
| ZVHH |
multiple |
Zero-Vehicle Household Dummy Variable (same as Zero VHH) |
| ZWHH |
multiple |
Zero-Worker Household Dummy Variable (same as Zero WHH) |