United States Department of Transportation
i
Rumble strip gaps for high speed bicycles on downgrades.
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2014-10-01
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[PDF-2.75 MB]
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Abstract:S
hou
lder rumble strips (SRS)
are
a proven
safety countermeasure that
reduc
e
motor
vehicle
lane departures
; however
,
they
may be seen as an impediment to bicycle travel as they
decrease comfort for bicyclists
and can impact one’s control while bicycling
. Exist
ing literature
provides recommendations for
the
placement of regular gaps in
SRS
, but the testing was limited
to low and moderate bicycle speeds.
Roads with SRS along long, steep grades present a unique
set of risks for cyclists due to the capacity for hi
gher bicycle speeds.
This
study evaluate
s
how
variations in
SRS
gap lengths and shoulder widths affect a bicyclist’s ability to maneuver
through these gaps when riding at higher than average bicycling speeds.
The findings suggest
that
as gap length incre
ases
,
bicyclist comfort
is maintained while
downhill speed also
increases
,
with subjects reporting fewer instances of discomfort as the gap size increased. The likelihood
of a bicyclist hitting a rumble strip while crossing a gap decreased modestly as the
gap size
increased.
Shoulder width did not appear to significantly influence a bicyclist’s capability of
maneuvering across different gap lengths and had only a minor effect on bicyclist speeds
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