1. Improved treatment of special attractors
Kevin Stefan
May 2017

2. Context
Some major facilities not represented well in destination choice models:
Airport, stadium, hospital, major mall, etc.
Unique characteristics
Often policy targets

3. Context Traditional approach usually to add to size or add k-factor
Alternative here: change travel disutility structure
Consistent with theory – higher order goods have a larger market areas

4. Brisbane model form Aggregate trip-based model Fully nested structure:
Number of trips
Destination choice
Mode choice
Hour of peak
Time of day AM
Mid PM
Off
SOV
PnR
HOV 2
HOV 3
KnR
Transit
Walk
Bike
6-7
7-8
8-9

5. Number of trips (generation)
Destination choice
TAZ
TAZ
TAZ
TAZ
TAZ
TAZ
TAZ
Mode choice
Hour of peak
Time of day AM
Mid PM
Off
SOV
PnR
HOV 2
HOV 3
KnR
Transit
Walk
Bike
6-7
7-8
8-9

6. Adult nonworker age < 55
40 model segments
8 person types
Primary student
Secondary student
Tertiary student
White collar worker
Blue collar worker
Adult nonworker age < 55
Adult nonworker 55-74
Adult nonworker 75+
× 5 purposes each
Home to primary*
Primary to home
Home to other
Other to home
Non home based
* Primary: School for students, work for workers, escort for ANW < 55, shop for ANW 55+

7. Model form: base Logsum of mode choice / time of day choice model
Additional distance function
Size term using population, school enrollment, employment (total and by ANZSIC)

8. Model form: Size treatment
Base model plus:
Additional size term reflecting total employment in special attractor zones
Calibrated to match total trips to SAs (as part of this study)

9. Model form: Distance treatment
Base model plus:
Additional parameters modifying the distance function
Not calibrated specifically for SAs

10. Distance treatment functions

14. Airport trips: size treatment

15. Airport trips: distance

16. Size
Distance
More from
further
suburbs
Too many
clustered
by airport

17. Conclusions Behavioural basis Attracts trips well
Better respects trip length distribution

18. Thank You! Thanks to my coauthors:
JD Hunt, Paul McMillan and Alan Brownlee, HBA Specto Inc.