Carpool uses increases somewhat when drivers asked to avoid car trips
<p>Altruism and Carbon Mitigation:
Evidence from Carpool Lanes and the Spare-the-Air Program</p>
<p>
Conclusions
STA causes 2.3% reduction in car trips, but FREE (fares) increase
car trips 5%
People do not substitute toward BART due to STA, but FREE
induces more car trips and BART trips
Subsidizing additional (“leisure”) trips?
Travelers do carpool more when asked to avoid car trips: Up to
3.65% more
The effectiveness of appeals declines on consecutive days; fatigue
associated with demands for altering normal behavior</p>
<p>
Implications
- Abandon free fare days.
- Explore policies that can entice motorists to maker permanent
switch to carpools.
- Choose STA days wisely (because of fatigue).
- Prosocial behavior can compliment regulatory policy but not
replace it.</p>
<p>
Steve Sexton - BECC 2010 Conference PPT </p>