Cross-section: Beacon St. in Brookline---
prepared by:
Jules Milner-Brage <http://milner-brage.com/jules>
revision as of:
July 18 - Aug. 13, 2017;
(minor: Oct. 1 - 14, 2017)
key:
all dimensions are in ft.;
re. paint-delimited space,
dimensions are from center to center of lines;
toward left (viewed in car direction) = earlier in listing,
toward right = later in listing;
'!' =
point of subtle sharing between walking/bicycling use
and car use (or walking use and bicycling use);
'?' =
undecided point in design
parameters:
([vehicle], [action(s)]---)
(inferred for 'current', maintained for 'POTENTIAL'---)
bicycle, travel + stop =
2.5 [wide] (x 6 [long]);
car, travel + park =
6.5 [wide] (x 17 [long]);
package delivery truck [#N4],
travel + park
(BUT non-conforming to stalls, re.:
angle (< stall) [where angled]
/ length (> stall) [where parallel]) =
(8 [wide] x) 22.5 [long];
fire truck, travel =
10 [wide]
- - - - - - - - - - - - - - - - - - - - - - - - -
default form---
(which exists at locations other than those,
primarily at cross-street/-path intersections,
where one/both of the curbs bulb out-/in-ward---)
current, "narrow side":
+ [car travel:]
{10.5 = (2) + 6.5 + (2)}
+ {12.5 = (2) + 6.5 + [!] (4)}
[(/ bicycling sharrow / (!) parked-car door)]
+ [edge: parallel car park:]
(7 = (0.5) + 6.5)
current (effective / potential), "narrow side":
+ [car travel:]
{10.5 = (2) + 6.5 + (2)}
+ {10.5 = (2) + 6.5 + (2)} [(/ bicycling sharrow)]
+ [edge: parallel car park:]
(9 = (2.5) + 6.5)
current, "wide side":
+ [median: car-park meter (/ parked-car bumper):]
(... 3 [RAISED] = ... 2.5 + (0.5 [curb]))
+ [median: head-in-angled car park
+ maneuver (/ (!) walking travel) (#N1):]
(32 =
{18 = (1.5) + 13 [painted line] + (3.5)} [park]
+ {11.5 = (2) + [!] 6.5 + (0.5 + 2.5 [RUMBLE])} [maneuver]
+ (1 [RUMBLE] + 1.5)
)
+ [car travel:]
{10.5 = (2) + 6.5 + (2)}
+ {11.5 = (2) + 6.5 + (3)}
+ [edge: bicycling travel (/ (!) parked-car door):]
{5 = (1) + 2.5 + [!] (1.5)}
+ [edge: parallel car park:]
(8 = (1.5) + 6.5)
+ [edge: car-park meter / bicycling/walking stop:]
(5 ... [RAISED] = (0.5 [curb]) + 2.5 ...)
POTENTIAL, "wide side":
+ [median: bicycling/walking stop:]
(... [RAISED])
+ [median: bicycling/walking travel
(change: EXPANDED, swapped left):]
{6.5 = (0.5) + 2.5 + (0.5) + 2.5 + (0.5)} [(CONTRA-car)]
+ {6.5 = (0.5) + 2.5 + (0.5) + 2.5 + (0.5)} [(car-same)]
+ [median: car-park meter
(/ parked-car {bumper OR door})
/ bicycling/walking stop
(change: MODIFIED, shifted right):]
(3.5 = 2.5 + (0.5 + 0.5 [RAISED curb (#N2)]))
+ [median: ... car park
(change: MODIFIED, shifted right):]
[BACK-in-angled (- maneuver) (#N1):]
(20.5 =
{18 = 17.5 + 0.5 [(?) RUMBLE]}
+ (1 [(?) RUMBLE] + 1.5)
)
OR [?] [PARALLEL + maneuver (#N3):]
(20.5 =
{7.5 = 6.5 + (1)} [park]
+ {10.5 = (2) + 6.5 + (1.5 + 0.5 [(?) RUMBLE])} [maneuver]
+ (1 [(?) RUMBLE] + 1.5)
)
+ [car travel (change: shifted right):]
{10.5 = (2) + 6.5 + (2)}
+ {10.5 = (2) + 6.5 + (2)} [(/ bicycling sharrow)]
+ [edge: parallel car park:]
(9 = (2.5) + 6.5)
+ [edge: car-park meter / walking/bicycling stop:]
(... [RAISED])
--------------------------------------------------------------------------
[#N1:]
viewed perpendicular to curb (above);
viewed parallel to curb:
12 [each stall];
BUT each stall actually angled 45 deg. to curb:
{8.5 = (1) + 6.5 + (1)} [wide] x
{17 + ... (~ 3.5 = 1.5 [RUMBLE] + 2)} [long];
presuming bumper is NOT overhanging curb;
BUT may actually BE, e.g.:
1 [perpendicular] (= ~ 1.5 [angled])
to 1.5 [perpendicular] (= ~ 2 [angled]);
if switched to 9 wide (1.25 door buffer on each side =
net 2.5 between adjacent stalls), then core stall
perpendicular dimension grows = 18.38 ~ 18.5
[#N2:]
perhaps segmented per car-parking stall and, where angled,
each segment rotated around one of its ends to match the angle
of `BACK-in-angled car park` (so that the other end of the
segment projects outward into `car park`)
[#N3:]
perhaps a reduction (- 40%) in the number of median parking
stalls (due to their orientation in this option) would be deemed
necessary and acceptable along some Beacon St. segments
(i.e., shortly before/after a major cross-street intersection,
esp. where additionally cross-cut by other, smaller streets,
e.g.: Winchester St. to Harvard St., Charles St. to Harvard St.),
in order to reduce spending time/throughput of the left-hand
through-travel lane on parking maneuvering (compared to in the
other option: to perform back-in-angled parking directly from
that through-travel lane),
made possible by means of the dedicated parking-maneuvering lane
in this option (which there is space for, in the cross-section,
due to the parallel stall orientation here)
[#N4:]
e.g.---
the USPS trucks:
frequently parked in the median of Beacon St. between Kent/
Powell St. and Pleasant St. during evenings and weekends,
which seem to be instances of the 22.5-ft.-long NACTO "DL-23"
("package delivery truck") vehicle type---
would need to be parked at a 30-deg. angle to the curb
(which would result in their occupying ~ 1.4 marked stalls),
in order to fit into the same amount of cross-section space as
a 17-ft.-long vehicle parked at the stall-marked 45-deg. angle