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Mass transit and walk/bike paths in San Diego’s 2050RTP Sustainible
Communities Strategy provide  less than 5% of fuel savings the
principal factor in GHG emissions.
95%  is provided by  already planned improvements to on-road,
vehicles with potential for even more. Especially for personal
transportation, in the time period to 2050.
 The entire near trivial SCS contribution to transportation energy
reduction can be replaced by less than a one MPG improvement in
on-road vehicles.
 $46 billion, 48% of the capital budget in 2050RTP is spent for
this near trivial impact,
Thus  SCS should be disapproved by ARB under its responsibility for
effective means to provide clean air quality despite agreement with
SANDAG analysis. Instead, as provided in SB-375, an alternative
Strategy should be recommended to correct the noted slippage of GHG
reduction after 2035, and provide support for further on-road
vehicle improvement and to correct increased traffic congestion

These findings are not explicit in 2050RTP or SCS. However they may
be calculated easily using table TA 3.1.
Assumptions:
    Comparisons are with respect to SANDAG’s 2008 existing
baseline, not the hypothetical No-Build.
    On-road vehicle occupancies  are; 1.3 for existing, and 1.4 for
2050 reflecting greater carpooling assumption.
   Mass transit existing energy use is 3,000 BTU/passenger-mile,
decreasing to 2050 at the same rate as on-road vehicles.

While there are non-transportation options in the current SCS to
reduce energy use and emissions, hopefully ARB will reject it as
part of a transportation plan responding to SB-375’s priority to
reduce energy and GHG through motor vehicle improvements and use.