[sustran] Re: Is TDM avoid or shift?

[Lloyd Wright]

Dear Carlos,

As you see from the discussion, the answer in part depends on how one
defines TDM.

However, if one confined the discussion to interventions that are most
typically associated with TDM (e.g. congestion charging, parking fees,
parking management, vehicle quotas, license plate restrictions, etc.), then
I would suggest the predominate impact is shift (at least in the short and
medium term).  Of course, there can also be some "avoid" impact in the long
term.

For example, if a city imposes a parking levy, then the most likely short
and medium term outcome would be a change in travel behavior in terms of
mode choice.  A person is more likely to shift to another mode rather than
giving up going to work or school altogether (e.g. shifting from driving to
public transport).  In the longer term, though, it is possible that the
person will make a locational change which reduces the distance traveled
(e.g. moving closer to work or school), which would represent "avoid".  This
would also result in a "shift" since the new location may allow the person
to shift to walking.

Best regards,

Lloyd

-----Original Message-----
From: sustran-discuss-bounces+lwright=vivacities.org at list.jca.apc.org
[mailto:sustran-discuss-bounces+lwright=vivacities.org at list.jca.apc.org] On
Behalf Of Carlosfelipe Pardo
Sent: 29 October 2013 22:44
To: Global 'South' Sustainable Transport
Subject: [sustran] Is TDM avoid or shift?

Ok, probably this has been discussed before, but I'd like to pose the
question to see people's views:

Under the ASI (avoid shift improve) approach, is TDM avoid or shift? Or
both?

Happy to hear everyone's views. I say shift!

Carlos.
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