2.
Response
to
Comments
2.9
Individual
Responses
to
Comments
from
Organizations
For
Brisbane
Baylands
travel
to/from
Superdistrict
1,
the
mode
share
for
travel
between
Superdistricts
3
and
4
(3
percent)
was
used.
This
is
because
the
inter-
centroid
distance
(i.e.
the
straight-line
distance
between
the
two
midpoints)
and
travel
choices
are
similar.
For
travel
to/from
Superdistrict
2,
the
mode
share
for
travel
between
Superdistricts
3
and
4
(3
percent)
was
also
used
for
similar
reasons.
For
travel
to/from
Superdistrict
3,
which
borders
Brisbane,
the
mode
share
for
travel
between
Superdistricts
2
and
3
(9
percent)
was
used
because
the
two
pairs
are
similar
in
that
they
are
adjacent
and
there
are
a
similar
array
of
travel
choices
available.
For
travel
to/from
the
rest
of
Brisbane
and
to/from
South
San
Francisco
and
San
Bruno,
the
mode
share
for
travel
within
Superdistrict
3
(20
percent)
was
used,
as
for
both
cases
travel
is
essentially
short-
distance
and
“intra-district.”
For
travel
to/from
Daly
City
and
Colma,
the
mode
share
for
travel
between
Superdistricts
3
and
4
(3
percent)
was
used,
because
both
pairs
are
adjacent,
most
trips
are
of
a
distance
of
a
few
miles,
and
there
is
hilly
terrain
separating
the
two
areas.
The
non-work
trip
mode
share
for
pedestrian/bicycle/other
modes
was
derived
from
the
SF
Guidelines
based
on
the
origin-destination
pair
within
the
Guidelines
adjudged
to
be
most
similar
to
the
origin-destination
pair
in
question.
Again,
Superdistrict
3
was
chosen
to
represent
the
Baylands
Project
Site
for
its
adjacency
to
Brisbane
Baylands.
Because
the
sample
size
of
non-work
trips
by
pedestrian/bicycle/other
modes
is
very
small,
work
trip
mode
share
was
used
as
the
basis
for
non-work
trip
mode
share
to
ensure
reasonable
results.
Work
trip
mode
shares
were
scaled
upward
according
to
the
typical
relationship
between
non-work
mode
shares
and
work
mode
shares.
The
scaling
factor
used
was
280
percent,
which
encapsulates
the
common
observation
of
a
higher
non-work
walk/bike/other
mode
split
when
compared
to
work
trips.
This
factor
was
determined
by
dividing
the
‘walk+other’
mode
share
for
visitor
trips
to/from
Superdistrict
3
by
the
overall
work
trip
‘walk+other’
mode
share
for
Superdistrict
3.
(The
visitor
trip
category
represents
non-work
trips
and
mode
share
was
calculated
as
the
average
of
retail
and
‘other’
categories.)
Upon
scaling,
non-work
mode
shares
were
capped
at
a
limit
of
40
percent
of
overall
non-work
trips
for
a
particular
district
to
reflect
the
maximum
share
that
could
reasonably
be
anticipated.
Auto
Mode
Share
Mode
share
by
automobile
was
then
derived
to
be
the
remainder
of
trips
when
transit,
bicycle,
walk,
and
other
trips
were
deducted.
Transit
Trip
Assignment.
After
estimating
the
transit
mode
share
of
Project
Site
development-related
trips
among
each
of
the
districts,
the
number
of
transit
riders
was
assigned
to
specific
transit
routes
serving
or
proposed
to
serve
the
study
area.
Brisbane
Baylands
Final
EIR
2.9.15-10
May
2015