1. Stratified Transit Market Segmentation
Multiple ways to Walk to Transit… Multiple Transit Modes to Walk to
TRB Transportation Planning Applications Conference
Dan Tempesta
Marty Milkovits
May 8, 2013

2. Presentation Overview
Typical Market Segmentation
Shortcomings of Typical Market Segmentation
Stratified Market Segmentation
The decision making for construction must balance out the tradeoffs between maintaining traffic (minimizing congestion, allowing local access, maintaining mobility) and Construction Concerns (safety ,cost and constructability)
THe right side of the balance is more easily quantified than the left. This presentation demonstrates how we quantify the left side.

3. Typical Market Segmentation
Available Mode Choice Options
DA: Drive Alone,
SR: Shared Ride,
WB: Walk to Bus,
WP: Walk to Premium,
DB: Drive to Bus,
DP: Drive to Premium, and
NM: Non-motorized Modes (Walk and Bike)
Options Defined by Access Mode and Transit Mode
The decision making for construction must balance out the tradeoffs between maintaining traffic (minimizing congestion, allowing local access, maintaining mobility) and Construction Concerns (safety ,cost and constructability)
THe right side of the balance is more easily quantified than the left. This presentation demonstrates how we quantify the left side.

4. Typical Market Segmentation
Mode Accessibility
DA: Drive Alone – Accessible to All TAZ
SR: Shared Ride – Accessible to All TAZ
WB: Walk to Bus – Accessible to TAZ with Transit
WP: Walk to Premium – Accessible to TAZ with Transit
DB: Drive to Bus – Accessible to All TAZ
DP: Drive to Premium – Accessible to All TAZ
The decision making for construction must balance out the tradeoffs between maintaining traffic (minimizing congestion, allowing local access, maintaining mobility) and Construction Concerns (safety ,cost and constructability)
THe right side of the balance is more easily quantified than the left. This presentation demonstrates how we quantify the left side.

5. Typical Market Segmentation
Availability/Accessibility
Accessibility – Zone Based
Availability – Zone Pair Based

6. Shortcomings Consider a TAZ with 2 transit stops
46% of the TAZ is walk accessible
54% of the TAZ is drive to transit accessible

7. Shortcomings Now add a new rail station
TAZ
66% of the TAZ is walk accessible
34% of the TAZ is drive to transit accessible

8. Why is this a Shortcoming?
The model will give 66% of the TAZ walk to transit accessibility
This overstates the accessibility of BOTH bus and rail
TAZ

9. Stratified Transit Market
Need Mode Specific Transit Buffers
Stratified Markets
Bus Accessible (Blue)
Rail Accessible (Red)
Bus & Rail Accessible (overlap), and
Auto Only Accessible (No Coverage)
TAZ
Accessible Mode
Percentage of Production TAZ
Bus/Auto
33%
Rail/Auto
20%
Bus/Rail/Auto
13%
Auto Only
34%

10. Implementation
The Devil is in the Details

11. Stratified Transit Market
The Paths Matter
“Bus” Trips are transit trips that do not use Rail at all during their trip
“Rail” Trips use rail at some point during their trip

12. Stratified Transit Market
Walk to Rail Restrictions
Bus/Rail indicates that no restriction is necessary and N/A indicates that there would not be a path available for this option by definition

13. Stratified Transit Market
Drive to Rail Restrictions
Bus/Rail indicates that no restriction is necessary and N/A indicates that there would not be a path available for this option by definition

14. Stratified Transit Market
Attraction
Production
Accessible Mode
Percentage of Production TAZ
Percentage of Attraction TAZ
Bus/Auto
33%
22%
Rail/Auto
20% 6%
Bus/Rail/Auto
13%
11%
Auto Only
34%
61%

15. Stratified Transit Market
Attraction
Production
Market Share
Attraction Mode Accessibilities
Total
Bus/Auto
Rail/Auto
Bus/Rail/
Auto
Auto Only
22% 6%
11%
61%
100%
Production Mode Accessibilities
33%
7.3%
2.0%
3.6%
20.1%
20%
4.4%
1.2%
2.2%
12.2%
Bus/Rail/Auto
13%
2.9%
0.8%
1.4%
7.9%
34%
7.5%
3.7%
20.7%

16. Stratified Transit Market

17. Stratified Transit Market
Combine Market Specific Paths with Market Shares

18. Conclusions
Stratifying the Transit Market will remove artificially high walk Accessibilities
Implementation Requires
Mode Specific Buffers
Path Restrictions