JAC Safety Manual - Chapter 9: Mauna Kea Safety
Policies-General
CHAPTER 9:
MAUNA KEA SAFETY POLICIES - GENERAL
A. Introduction
This chapter sets general policies and procedures for safety
of
staff
on
Mauna Kea and includes the emergency plans and equipment locations for
JCMT and UKIRT. Other policies and procedures specific to the telescope
sites are covered in the next chapter.
Mauna Kea is an isolated site with special hazards, some
of
which
are
not obvious especially to visitors. You should be aware of the hazards
given in this manual and be prepared to comply with the requirements of
the TSS/WL, especially as regards evacuation of a summit facility. The
"Mauna Kea Observatories Winter Policies and Procedures" are given in Addendum
9.
B. Hale Pohaku
1. Policy
Conditions at Hale Pohaku (HP) are unusual due to its
remote location and
high
altitude.
There are special hazards which are not always self evident. All new
employees
will receive orientation on safety related equipment, policies and
procedures.
2. Responsibilities
- Supervisor
Ensures that new employees receive appropriate training
and
that any
new procedures introduced are fully explained to staff. Informs the
Site
Safety Advisor of any safety related issues.
- Employee
Follows all safety policies and alerts supervisor to
any
potential
hazards.
- Site Safety Advisor
Advises all staff of any new safety related items and
acts as
a liaison
between the Mauna Kea Support Services and JAC.
3. Procedures
- All staff and visitors shall familiarize
themselves with the
safety
information
packet that is provided at Hale Pohaku in individual rooms.
- All staff and visitors should be aware of
any special
messages
posted
on
the weather notice board near the main entrance. Our policy is to
follow
any direct instructions given on the board and signed by the MKSS
representative.
C. Emergency Procedures for
Ice/Snow/Poor
Road Conditions
1. Policy
This section covers emergency procedures involving
staff/observers
on Mauna Kea. Due to high altitude hazards of Mauna Kea and the
possibility
of week long storms which make rescue at the summit impossible, staff
and
observers shall be well acquainted with the procedures in this
section.
2. Responsibilities
- Supervisor
Supervisors need to ensure that their staff are aware of,
and
follow,
the procedures below.
- Employee
Maintains awareness of the Ice/Snow/Poor Road
Condition
procedures.
3. Procedures
- If Ice/Snow/Poor Road Conditions
occur
before your
required
presence
at the summit follow the procedures below.
-
To help establish the extent of the ice/snow/poor
road
conditions the
following
procedures shall be followed:
- If the road closed sign is
posted on the
road, do not drive
past it
unless
you have clearance from the MKSS General Manager or his representative.
- Road and weather
information will be
posted on the message
board in the
Hale Pohaku Lobby.
- Once
access is
available to each of
the
facilities,
an announcement will be made using the HP message board. Check email
for
road conditions as well.
- The MKSS General
Manager will be
available for specific
updates
to observatory
staff at HP.
- The general public
will be notified
through the summit
weather report message machine generally by 6:30 a.m. Public calls
to facilities asking about conditions should be referred to this phone
number.
- When
the road
is closed to the
public
but open
to facilities only, observatory vehicles will be allowed to pass
the roadblock.
- Snow
removal
vehicles have the
"right
of way".
Do not pass equipment without the operator's attention.
- If it is recommended
that snow chains
be used by the MKSS
General Manager
then staff shall install chains. If you are not familiar with
installing
chains, the JAC Site Safety Advisor can arrange instruction at your
request.
- If
Ice/Snow/Poor
Road Conditions
occur
when you are at JCMT or UKIRT (summit) follow the procedures below.
- Establish and maintain
regular contact with
the Facility Maintenance Manager and Snow Crew
Leader
regardless
of the time as well as with other facilities on Mauna Kea.
- Monitor, by both remote
and visual
inspection, the status
of the
weather at the summit.
-
Staff should position
the carousel
(JCMT), dome (UKIRT) as
follows:
- JCMT-Position the
carousel such that the
roof support gantry
is
diametrically
opposite the main entrance (telescope pointing toward UKIRT in the
parked
position at an azimuth of about 93 degrees). Ensure that the main
shutter doores are closed and secured.
- UKIRT-Position dome
shutter out of
the wind.
- If
because of
worsening conditions
the
decision
is made to evacuate the facility, staff shall notify others on
MK.
A phone tree has been established to notify all facilities. Call one
member
of your group and one from the other group. Ask them to call the rest
of
the group.
Group A:
CFHT
(961-2630)
Gemini (974-2650)
UH 88" (974-4200)
UKIRT (961-6091)
IRTF (974-4208)
Group B:
KECK
(935-8643)
Subaru (935-5861)
SMA (933-6990)
JCMT (935-0852)
CSO (935-9853)
If practicable notify JAC Hilo Office (Site Safety
Advisor) of
the evacuation.
On arrival at Hale Pohaku staff shall contact the Facility Maintenance
Manager, Site Safety Advisor,
or the snow crew leader.
- Report
road
conditions to MKSS by
calling
one of
the following numbers.
Days:
MKSS Hilo Office (974-4205)
HP
(935-7606)
Utility Dept. (934-4541)
OMKM Ranger cell: (960-2820) a.m./p.m. patrol
cell: (960-3077) at Visitor Center
After Hours/weekends/holidays:
HP
(935-7606)
MKSS General Manager before 10:00p.m. (959-5419)
MKSS General Manager after 10:00p.m. leave email
(koehler@ifa.hawaii.edu)
Send email to road-conditions:
(see
address in JAC Eyes Only)
This allows the MKSS road crew to be ready to clear
the
MK summit
road as soon as possible.
- Write road and weather
conditions on the
message board at the
Hale
Pohaku
lobby including the date, time, conditions encountered and the staff
member's
name and telescope.
- Additional information
and winter
contact numbers can
be
found in
the Mauna Kea Support Services Emergency Procedures (red booklet).
D. This section has been left blank
intentionally
E. Personal Protective
Equipment
Specific to Mauna Kea
1. Policy
JAC policy on use of personal protective equipment (PPE) is
in Chapter
3. PPE relevant to all JAC sites is covered in that chapter.
Equipment specific to Mauna Kea is described below.
2. Responsibilities
- Supervisor
- Implements JAC policy by
assessing hazards,
removing them where
feasible
and otherwise arranging for provision of PPE.
- Ensures that staff are
familiar with the PPE
provided and are
properly
trained in its use.
- Employee
- Uses all PPE as required
and in accordance
with training given.
- Alerts supervisor if PPE is
defective or
missing.
- Alerts supervisor to any
hazardous situations
requiring
additional PPE.
- Site Safety Advisor
Arranges and purchases recommended PPE. Assists
supervisor
in choosing the appropriate PPE.
3. Procedures
- Sunglasses:
- It is recommended that
anyone driving or working outside
in the daytime on
the
summit
should wear UV protective glasses;
-
Subject to the approval of
the Site Safety Advisor, staff who require UV protective glasses (and
who do not already own a suitable pair) may claim a contribution
towards the cost as follows:
-
Non-prescription UV blocking sunglasses an
allowance of up to $60 towards the total cost;
-
Prescription UV blocking sunglasses the actual,
reasonable costs of prescription lenses plus an allowance of up to $60
towards the cost of the frames.
In both cases, an itemised
receipt for the purchase of the sunglasses is required.
-
Should the eyewear require replacement, the
allowances may be repeated with the approval of the Site Safety Advisor.
- Cold weather gear:
Down jackets and gloves are
provided for staff who work
frequently
at the summit. This provision is administered by the Site Safety
Advisor
who will determine the need for new or replacement items. Cleaning
costs
will be borne by the JAC.
- Sunscreen
Any staff who are working
outside for more than a few
minutes
should
wear sunscreen. Sunscreen is provided in sachets in the first aid
cabinets
at JCMT and UKIRT.
Note: Personal equipment provided at JAC's
expense
shall be
surrendered
upon leaving the JAC if the Site Safety Advisor considers it
appropriate.
- The following equipment are
provided for
staff at the
summit:
(see Chapter
11 C for locations)
- laser glasses
- hard hats
- back supports (JCMT only)
- harnesses
- wet weather gear
- insulated cryogenic gloves,
protective
goggles, face shields
F. Summit Smoking
Policy
Policy
In compliance with Hawaii State law, smoking is prohibited
in
all JAC buildings, including the facilities at the summit. In
addition, smoking is prohibited within 20 feet of entrances, exits,
windows that open, and ventilation intakes that serve an enclosed or
partially enclosed area where smoking is prohibited.
G. Policy on Stays at High
Altitude
1. General Policy
Safety at altitude depends on common sense. This
dictates
that
workers on Mauna Kea (MK) - especially newcomers - shall acclimatize
cautiously
and not proceed above HP if feeling unwell. Staff should
be familiar with the symptoms of serious altitude sickness, monitor the
condition of fellow workers, and know what action to take if a problem
arises. See Chapter 9 section J for a full list
of
symptoms and Chapter 11 section J for
procedures to follow should anyone be affected. Everyone on MK should
be
aware that altitude can affect the judgement of individuals, sometimes
dangerously. Visitors should avoid strenuous activities. Persons with
known
medical conditions that could affect them at altitude should be
discouraged
from visiting the summit.
2. Responsibilities
- JAC Staff
- All
staff who are
required to work
above
HP must
take, and pass, a High Altitude Physical exam upon joining JAC and
repeat
it at the frequency specified in section H4.
JAC
staff, not required to work above HP but who may visit the summit
occasionally,
need not take the full examination, but should confirm with their
physician
that there are no known medical reasons why they should not travel to
altitude.
The Site Safety Advisor shall interpret this rule on a case by case
basis
should an interpretation be required.
- No more than 14 hours
shall be spent
above HP in any 24-hour
period.
- For planned stays
above HP of not more
than 8 consecutive
hours, staff
travelling up from sea-level are recommended to rest at HP for at least
30 minutes to help get adjusted to altitude. Staff who have not been to
altitude for a long period, say one to two weeks, or who may be
suffering
jet lag, are recommended to extend the rest period as in iv. below.
- Staff planning to be
above HP for
between 8 and 14
consecutive
hours are
recommended to spend at least eight hours at HP before proceeding to
the
summit.
- If
staff who
have been working late
feel it is
unsafe for them to drive down to Hilo they are encouraged to sleep over
at HP. Provisions have been made for accommodation to be provided. This
may be accomplished by contacting a cook (if available) or by using one
of the 3 contact phone numbers located on the front counter.
- Note the provisions
in section J2 for
staff or visitors
who suffer persistently from symptoms of mountain sickness.
- STFC
Staff
All STFC employees, whether JAC staff or visitors,
must have
completed
a high altitude physical exam prior to traveling above HP. STFC
employees
are specifically prohibited from traveling above HP having only signed
a medical disclaimer. This is a STFC requirement to which there are no
exceptions.
- Observers
- All observers planning to
go to the telescope
must read and
sign the
Medical
Alert Disclaimer form which warns of the potential dangers of working
at
altitude.
- No more than 14 hours
shall be spent
above HP in any 24-hour
period.
- It is recommended
that observers coming
from sea-level who
plan
to stay
above HP for not more than eight consecutive hours rest at HP for at
least
30 minutes to get adjusted to altitude. Those who have not been to
altitude
for one to two weeks, or who may be suffering jet lag, are recommended
to extend the rest period as in item iv. below.
- It is recommended
that observers coming
from sea-level who
have
travelled
more than 1000 miles OR who plan to stay above HP for more than eight
consecutive
hours spend at least eight hours (and preferably the night before their
observing run) at HP, before proceeding to the summit.
- Note the provisions
in section J for
staff or visitors
who suffer persistently from symptoms of mountain sickness.
- Visitors
- The JAC policy for visits to
the summit can
be found in the
administration
procedures published on the internal web. Follow
the link here.
- On pre-arranged visits to the summit,
all visitors must
either
sign a Medical
Alert Disclaimer Form or have prior medical clearance - regardless
of the time they intend to spend above HP. The completed form shall be
returned to the JCMT or UKIRT secretaries respectively by the person
inviting
or admitting the visitors. Normally, casual visits to the summit will
not
exceed three consecutive hours, and for planned visits of this
duration,
a minimum rest period of one hour is recommended. Exceptionally, where
casual visits are planned for periods of over three hours or where
visitors
have travelled more than 1000 miles without a suitable break, it is
recommended
that the rest period at HP is extended as in item 4 above. Visitors
under
the age of 16 years are not permitted.
- Tourists
and
visitors without
pre-arrangements who
arrive at the summit unannounced may be admitted to the telescope
provided
that
- the party is not too
large to be safely
supervised;
- a member of staff is
available and willing
to be responsible
for them;
- they sign disclaimers.
Parties of tourists on MKSS
tours may be admitted to JCMT
at
the
weekend
with the prior agreement of the TSS and subject to precedence of other
duties. Parties of tourists from commercial tour companies will not be
admitted.
- Should a tourist seek
assistance when
ill, the
staff
concerned
must exercise
their initiative in balancing the needs of the patient with those of
the
JAC. Options include:
- Calling the emergency
services for advice
or assistance
- Allowing the patient to rest
- Obtaining assistance from
other summit
facilities (e.g.
arranging for a
ride to HP)
- In extreme circumstances
taking the patient
to HP or Hilo
which may
involve
closing the facility.
3. Building Safety
No one should be left alone in JCMT or UKIRT. There should
always be
at least two people in or around the building when it is occupied,
including
lunch time. There must always be a working vehicle available when the
building
is occupied. At least one occupant must be capable of driving the
4-wheel
drive vehicle. There must be enough seats in the available vehicles to
accommodate the number of people in the building.
4. Consumption of
Alcohol at
HP
or the Summit
- Consumption of alcohol at the summit is
prohibited.
- Any staff who have consumed
alcohol may not
drive a JAC vehicle
or work
in a JAC facility for at least 8 hours.
- Operation of a JAC vehicle
while under the
influence of alcohol
is
strictly
prohibited.
5. Sleeping at the Summit
Staff should not sleep at the summit unless stranded due to
bad
weather.
JAC policies are designed to avoid such situations because of the
potential
hazards posed by sleeping at the summit.
6. SCUBA diving
before going
to
high altitude
If you ascend to high altitude after SCUBA diving you
risk formation of nitrogen bubbles in your bloodstream. This leads to a
potentially fatal condition called "Decompression Sickness" (commonly
known
as "the bends"). It is thus vitally important that you not ascend to
high
altitude (HP or above) too soon after SCUBA diving.
You should wait at least 24 hours after diving before
ascending to
HP
altitude. If you have made repetitive or deep dives or are in any
doubt,
you should extend this interval to at least 48 hours.
H. High Altitude Physical
Examination
1. Procedures
The high altitude medical may be administered by
JAC's
consulting
physician, or by the physician of the member of staff. If the
latter
is the case, then a form shall be obtained from Personnel Section for
the physician to fill in. In either case, the CERTIFICATE OF FITNESS
FOR
WORK AT HIGH ALTITUDE, also available from Personnel Section,
must be
completed.
2. Special medical examination form
You may obtain the SPECIAL MEDICAL EXAMINATION PRIOR
TO
WORK
AT HIGH ALTITUDE form from the JAC Personnel Section.
3. Certificate of fitness for work at high altitude
You may obtain the CERTIFICATE OF FITNESS FOR WORK AT
HIGH
ALTITUDE form from the JAC Personnel Section.
4. Exam Frequencies
Age Category
/
Frequency of Rechecks
Before
30
Every 5 years
Before
40
Every 3 years
Before
50
Every 2 years
After
50
Every year*
* Annual examinations will also apply to staff with an
identified
medical
problem but who are still considered fit to work at altitude.
Any member of staff who is required to work on the
summit may
still
request to have an annual medical examination.
I. Medical Alert Disclaimer
Form
J. Acute Mountain
Sickness
1. General
All staff and visitors should be familiar with the signs
and
symptoms
of high altitude/mountain sickness. JAC policy is to err on the side of
safety when dealing with actual or potential mountain sickness.
Visitors or staff experiencing symptoms should inform the Telescope
System Specialist or Work Leader at once. A decision will then be taken
on whether the individual should descend from altitude. A list of
high altitude sickness symptoms follows:
Minor Symptoms
- mild shortness of breath
- dizziness
- lightheadedness
- headaches
- a change in visual activity
- palpitations
- chest tightness
- nausea
Major Symptoms
- shortness of breath
- sudden onset of severe
unrelenting headaches
- chest pain
- abdominal pain
Major Signs
- slurred speech
- visual disturbance
- loss of coordination
- paralysis
- seizures
- collapse
- slow or rapid heart beat
- labored breathing
- unrelenting nausea or
vomiting
WARNING: It may not be sufficient to descend to
Hale
Pohaku
upon
experiencing high altitude sickness. If in doubt, descend to Hilo.
Report
all cases of high altitude sickness to the Site Safety Advisor within
24
hours.
2. Persistent
Symptoms
In all cases of mountain sickness the decision on whether
an
individual should descend from altitude rests with the Telescope System
Specialist or the Work Leader. Every case must be assessed in the light
of the symptoms but particular provisions apply to visitors and staff
who suffer from repeated incidents of mountain sickness:
- Visitors
If a visitor is sick on two consecutive observing runs they
shall be instructed to leave the summit and to seek medical advice
before returning. A visitor having a history of illness at the
summit shall be instructed to leave upon a single new incident of
illness unless they have a statement from a medical physician
confirming that it is safe for them to continue working if the symptoms
are recognized as minor and recurrent.
- Staff
If a staff member is sick on two consecutive trips to the
summit
they
must seek medical advice - normally from JAC's consulting physician -
before
returning.
K. Vehicle Operation
1. Policy
JAC vehicles are to be operated safely in a manner
consistent
with local, state, and federal laws. All accidents must be reported
promptly
according to the procedures outlined below. Smoking is not permitted in
JAC vehicles.
2. Responsibilities
- Driver's Supervisor
Ensures that vehicles are used only for official JAC
business
and carries only authorized passengers.
- Facility Maintenance
Manager/Fleet Manager
- Oversees maintenance and
repair of vehicles.
- Ensures that vehicles are
equipped with a
spare tire, jack, lug
wrench,
and general safety equipment.
- Fleet Manager
Periodically inspects vehicles and ensures performance
of
scheduled maintenance.
- Driver
- Uses the vehicle only for
conducting official
business of the
JAC.
- Wears seat belt at all
times while the
vehicle is in
motion.
The driver
shall also ensure that all passengers fasten their seat belts before
the
vehicle is in motion in accordance with JAC rules at K.3.b.iii.
below.
- Operates the vehicle in
a safe manner
conforming to traffic
laws and road
conditions.
- Must check that the
vehicle is in safe
working condition
before
use.
- All
minor and
major vehicle
problems
must be reported
via email to "vehicle" (see
address in JAC Eyes Only). Major vehicle problems
occurring
outside of normal working hours must also be reported to the Site
Safety
Advisor by phone. Phone numbers are listed in the Vehicle Information
booklet
located in the glove compartment of all JAC vehicles. Before leaving
any
potentially unsafe vehicle, place a written note in a prominent
location
(e.g. driver's seat) briefly explaining the situation and hang the
"Vehicle
Unsafe" tag on the mirror. This tag is located in the vehicle's glove
compartment.
3. Procedures
- Reporting Vehicle Problems
- Vehicle problems shall be submitted to
the
vehicle scheduler
via e-mail
to "vehicle" (see
address in JAC Eyes Only) for
prompt action.
- If involved in a
vehicle accident,
follow the Motor Vehicle
Accident Procedures
in the Vehicle Information Booklet. The booklet is located in the glove
compartment of all JAC vehicles.
- Driving
Procedures
- Before taking a JAC vehicle to Mauna
Kea,
take it to the
designated
service
station and fill it with gasoline.
- When to fill-up
gasoline:
- 4-wheel drive vehicles:
Always fill-up on
the way to the
summit because
a schedule change may require that vehicle to remain at the summit.
- 2-wheel drive vehicles:
It is recommended
that these
vehicles be filled
as well. This must be done if there is less than 1/4 tank of fuel.
- If less than 1/4 tank
gas remains then it
is recommended to
fill-up the
tank upon returning to Hilo.
- Staff and visitors who have
never driven JAC vehicles on
the MK summit road
must
drive
at least one round-trip carrying an experienced driver as a passenger
before
driving alone. The experienced driver must explain all of the points on
the driver's checklist in Addendum 8
and
the
new driver should keep a copy for reference. This requirement must be
repeated on
every occasion where there is a period of more than 12 months between
drives on the MK summit road. If new drivers wish to be
driven a short distance before they make the accompanied drive, that
wish shall be accommodated.
In
cases where the visitor has
experience of driving on the MK summit road in non-JAC vehicles within
the previous 12 months (e.g. visiting astronomers from other MK
observatories), the JAC associated staff member must still ensure that
the visitor is briefed on the current JAC vehicle use policy and is
given a copy of the driver's checklist at Addendum
8.
- For everyone's safety,
all occupants of
the vehicle must
wear
seat belts
while the vehicle is moving.
- JAC vehicles must not
be used to
transport people under age
16
to the summit.
- JAC vehicles shall not
be used to tow
other vehicles
except
our own JAC
vehicles. If you are called to give assistance the normal response
shall
be to call the emergency services or a breakdown service.
- JAC vehicles must not
be used to
pick-up hitch hikers
unless
they are injured
or in distress. In all cases consider calling the emergency services
for
professional help.
- Follow posted summit
speed limits.
- Follow instructions for
operating JAC's
4-wheel drive
vehicles
on the summit.
(instructions are located in the vehicle)
- All JAC vehicles must
be locked upon
parking in the JAC
Hilo
office and
HP parking lots. This is because there have been instances of
safety-related
equipment being stolen. Vehicles must be left un-locked at the summit
in
order to avoid the locks freezing closed.
- Before taking a vehicle
to the summit
from HP - check the
fuel
level -
there must be no less than a quarter of a tank of fuel as this is the
minimum
amount of fuel necessary to reach Hilo in cases of emergency.
- All windows must be
kept closed between
HP and the summit
to
reduce dust
in vehicles.
- Driving on the road
above HP around
dusk or dawn may
present
severe hazards
associated with glare from the low sun angles and dust. The advice of
the
TSS/WL on safe departure times from HP and UKIRT/JCMT shall be heeded.
- Be sure that when
traveling to or from
Mauna Kea you have
adequate clothing.
- When driving on the
summit road,
drivers shall use
headlights
during the
day whenever there is fog, rain or snow; at twilight; and where
visibility
to oncoming traffic is obscured by dust in the air and sunlight behind
them.
- A portable cellular phone is available
for checkout
in
Hilo from the
receptionist.
- Winter Driving Procedures
- During the winter months two JAC
vehicles are
equipped with
studded
tires.
These two vehicles should normally be used only during the night, they
may be used during the day only if no other vehicle is available. The
vehicles shall not be driven below HP except in dire emergencies.
- All 4-wheel drive
vehicles have snow
chains stored in the vehicle.
- During hazardous
driving conditions,
those with the most
summit
driving
experience should drive.
- When driving downhill
on ice, use the
lowest possible gear
and
try not
to use the brakes.
- All staff/observers
shall maintain a
watch for dangerous
road
conditions
and inform MKSS and other observatories as appropriate.
- If MKSS issues an
evacuation or road
closed order, all
facilities must
comply.
- During icy or snowy
conditions use the
gears rather than
the
parking brake
when parking at the summit to avoid brake freezing. Block the tires if
appropriate.
4. Safety Equipment
- All vehicles are fitted with:
- flashlight - located in the
front glove
compartment
- fire extinguisher
- first aid kit
- first aid exposure
protection kit
- pocket rescue mask
- highway safety kit
- snow chains (4WD vehicles
only)
- gloves for use in emergency
- emergency blankets -
located
both in the glove
compartment and rear
storage box
- battery jumper cables
- unsafe vehicle tag
- tire pressure gauge
- vehicle information booklet:
- dust control instructions
- satellite phone
instructions
- tire pressure
specifications
- vehicle accident
procedures
- emergency telephone
numbers
- public roadblock
guidelines
- driving instructions for
4WD vehicles (4WDs
only)
- Mauna Kea winter driving
recommendations
(4WDs only)
- Mauna Kea vehicle
procedures checklist (Addendum
8)
- map of routes to Hilo
Medical Center
- summit fire policy/responsibilities/re-entry
procedures
- Safety kits and a cellular
phone for
rental vehicles
travelling
to Mauna
Kea, may be checked-out at the JAC reception desk. Rental vehicle
safety
kit contains:
- Two emergency thermal
blankets
- First aid exposure
protection kit
- Flashlight
- Fire extinguisher
- Pocket mask
- Gloves
- Highway safety kit
- Battery jumper cables
- First aid kit
- Satellite phones shall
be used for emergencies only.
5. Staff Stranded at Night
The first recourse if a JAC vehicle breaks down in the
night
is to summon assistance using the satellite phone. Staff should use
common sense in
determining
whether it's safer to wait in the vehicle until another vehicle passes
by, or attempt to walk, leaving the vehicle clearly marked as a hazard
for other road users (see also section K3b above).
Decisions should take account of the time of night, weather conditions
and suitable clothing.
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