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Traffic SafetyTraffic Safety
TS4273 Traffic EngineeringTS4273 Traffic Engineering
SPEED REALLY DOES KILL
WHO DOES SPEED KILL
WHERE DOES SPEED KILL
HOW DOES SPEED KILL
DID YOU KNOW?DID YOU KNOW?• 80% of
motorcycle crashes kill or injure rider.
• While 20% of car crashes kill or injure a vehicle occupant.
The First Road Traffic Accident!
• The first recorded Road Traffic Accident was Bridget Driscoll in London, August 17th.1896.
• The Coroner stated that it was easily avoidable and should never happen again.
• It Has… Over 25 million times!
What is an Accident?
• Up until 1650 an accident was seen as either Witchcraft or Gods will.
• It was then that social science began by recording births, deaths & later marriages.
Traffic Safety
• Safety is the condition in which the risk of harm or damage is limited to an acceptable level
• State of mind that make people Thinking, Acting, Behave in such way to minimizing the exposure to danger.
Dampak Kecelakaan Transportasi DaratDampak Kecelakaan Transportasi Darat
• GLOBALGLOBAL– Korban meninggal dunia rata-rata 1 juta Korban meninggal dunia rata-rata 1 juta
jiwa per tahun (1,200,000 persons per year jiwa per tahun (1,200,000 persons per year 10 jumbo jet crashes per day!) 10 jumbo jet crashes per day!)
– 75% terjadi di negara berkembang75% terjadi di negara berkembang
– Kerugian mencapai 2% GDP (US$ 100 Kerugian mencapai 2% GDP (US$ 100 Milyar)Milyar)
Dampak Kecelakaan Transportasi Darat
• NASIONAL– Korban meninggal dunia rata-rata 30 jiwa per
hari
– Kerugian sekitar US$ 3,5 Milyar sekitar 2,17% GDP Indonesia
CRIME vs. CRASH CLOCK(2002)
CRIME vs. CRASH CLOCK(2002)
1 murderevery 32 minutes1 murderevery 32 minutes
1 aggravated assaultevery 35 seconds1 aggravated assaultevery 35 seconds
1 violent crimeevery 22 seconds1 violent crimeevery 22 seconds
1 fatality every 12 minutes1 fatality every 12 minutes
1 injuryevery 16 seconds1 injuryevery 16 seconds
1 crashevery 5 seconds1 crashevery 5 seconds
Death and Traffic Accidents1990 Rank 2020 Rank
Disease / Injury Rank Disease / Injury Rank
Respiratory 1 Ischaemic Heart Diseases 1
Diarhoeal Diseases 2 Unipolar Major Depression 2
Perinatal 3 Road Traffic Accidents 3
Unipolar Major Depression 4 Cerebrovascular Diseases 4
Ischaemic Heart Diseases 5 Pulmonary 5
Cerebrovascular Diseases 6 Respiratory 6
Tuberculosis 7 Tuberculosis 7
Measles 8 Diarhoeal Diseases 8
Road Traffic Accidents 9 HIV 9
Congenital Anomalities 10 Perinatal 10
Malaria 11 Congenital Anomalities 11
Pulmonary 12 Measles 12
Fatality Rate 100 Million Passenger-Miles in Transport in the United States
Mode Rate
Autos and Taxis 1,90
Motorcycles 17,00
Local Transit 0,16
Buses 0,19
Railroads 0,53
Domestic Scheduled Air Carriers 0,13
Water Transport NA
Prime Cause of Road Accidents
Cause % of Accident
Human Factors Alone 65
Human + Road 25
Human + Vehicle 5
Road Factors Alone 2
Vehicle Factors Alone 2
Human + Road + Vehicle 1
TOTAL 100
Americans Killed in Combat vs.
Motor Vehicle Fatalities
Americans Killed in Combat vs.
Motor Vehicle Fatalities
Motor Vehicle
Fatalities
Combat
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
Nu
mb
er
of
De
ath
sAmericans Killed in Combat
vs.Motor Vehicle Fatalities
Americans Killed in Combat vs.
Motor Vehicle Fatalities
3,070,1893,070,1893,070,1893,070,189
620,219620,219620,219620,219
(225 years) (100 years)
Cars and Weapons!Cars and Weapons!
• Cars have killed more people since their invention than all the wars and conflicts put together – including both World Wars!
General Road Accident Statistics in Malaysia
Statistics Road Accidents in Malaysia (2005)
Causes of Traffic accidents in Malaysia
• Combination of traffic composition
• Improper intersection design
• Provision of street lightning
• High traffic volume
• Provision of pedestrian crossing
• Signal light
• Vehicle speed
Statistical Report Road Accident, Royal Malaysian Police. 2005
Statistical Report Road Accident, Royal Malaysian Police. 2005
Fatality Model and Safety Target in Malaysia
Predictive Model of Yearly Traffic Deaths
Approaches used in Road Safety Programmes
• Accident Preventions (proactive action)
• Accident Reduction (reactive action)– Improvement of hazardous location– Motorcycle lane– Paving of road shoulder– Improvement of dangerous curve
Approaches used in Road Safety Programmes
– Pedestrian crossing– Overtaking lane– Street lighting– Road Maintenance
• Road Maintenance
• Building New Road
Fatalities per 10.000 Vehicles
Profil Jumlah Kendaraan di Indonesia Tahun 1990 - 2003
0
5,000,000
10,000,000
15,000,000
20,000,000
25,000,000
30,000,000
35,000,000
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
Tahun
Ju
mla
h K
end
ara
an
Mobil Bus Truk Motor
Profil Kecelakaan Jalan di Indonesia Tahun 1990 - 2003
0
2,500
5,000
7,500
10,000
12,500
15,000
17,500
20,000
22,500
25,000
27,500
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
Tahun
Ju
mla
h K
eja
dia
n
Profil Kecelakaan Jalan di Indonesia Tahun 1990 - 2003
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
45,000
50,000
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
Tahun
Ju
mla
h K
orb
an
Meninggal Luka Berat Luka Ringan
Profil Kecelakaan Jalan di Indonesia Tahun 1990 - 2003
0
5,000,000,000
10,000,000,000
15,000,000,000
20,000,000,000
25,000,000,000
30,000,000,000
35,000,000,000
40,000,000,000
45,000,000,000
50,000,000,000
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
Tahun
Ju
mla
h K
eru
gia
n (
Ju
ta R
p.)
-
5
10
15
20
25
16 - 20 Tahun 21 - 25 Tahun 26 - 30 Tahun 31 - 35 Tahun 36 - 40 Tahun 41 - 75 Tahun
Kelompok Usia
Per
sen
tase
Faktor Penyebab Kecelakaan di Indonesia
• Pengguna Jalan (lengah, mabuk, ngebut, jarak terlalu dekat, penyeberang jalan, hewan) 93,52%
• Jalan (persimpangan, marka/rambu tidak jelas, permukaan licin) 3,23%
• Kendaraan (ban pecah, rem blong, kemudi dan lampu tidak berfungsi) 2,76%
• Lingkungan (mix traffic, pengawasan dan penegakan hukum, cuaca) 0,49%
The Weak Link!
Millions of dollars are spent every year on safer car design and car safety systems.
Millions of dollars are spent every year on safer road designs
Only a few hundred dollars is spent on the most important factor…THE DRIVER!
Age – the younger driver
• Limited skills• Sense of overconfidence• Younger drivers tend to drive
faster, drive at night, and drive while drunk.
• After the first year of driving, young drivers have acquired the basic control skills of driving but not the tactical and strategic judgment needed for safe driving.
Age – the older driver
• Information-processing impairments• Slower response time• A more restricted field of attention• Reduced time-sharing abilities• Reduced visual capacity, especially at night• Older drivers compensate by driving more slowly and
by not driving at night.• Older drivers drive less safely at the control level but
can compensate with appropriate choices at the tactical and strategic levels.
The Impaired Driver
• Alcohol– Involved in approximately 50% of fatal highway
accidents in the U.S.
– With blood alcohol content as low as 0.05%, drivers react more slowly, are poorer at tracking, are less effective at time-sharing, and show impaired information processing.
– One of the most effect interventions may be social norming.
• Fatigue has roughly the same effect as alcohol.
Impairment interactions
• A combination of fatigue, alcohol, and age can combine to degrade driving performance
• The presence of passengers may be distracting and encourage risky behavior.
• A young person driving with friends at night and after drinking is an extremely dangerous combination.
Perilaku Pengendara
Perilaku Pengendara
Perilaku Pengendara
Perilaku Pengendara
Perilaku Pengendara
Perilaku Pengendara
DISTRACTED DRIVING• Does Cause Crashes
– No Reliable info on degree of involvement
• Cell Phones
– The worst
– Hands free is no better
• DVD Players
– Portable and mounted
– Rapidly growing issue
• All the old standbys
– Not as bad as above
Drowsy & Distracted Driving
DISTRACTED DRIVING
The 3 ‘E’s
Education
EngineeringEnforcement
Education
“The raising awareness of hazards and how to avoid them”
• Child car seats• Green Cross Code• Induction training• Subliminal Advertising• Incentive schemes• Accident Investigations
Training and selection
• Tests of static visual acuity have very little relevance for driving.
• Driver's Education class may not help.
• Behind the wheel navigation in a vehicle may not be the best test.
• Simulators for training and for testing can be helpful and cost effective.
Driver adaptation and risk calibration
• People do not respond rapidly to the unexpected.
• Since most people have not been in an accident, their expectancy is set at zero.
• Risk homeostasis - people tend to maintain their risk even with added safety features.
Condition DiagramsLocation: That Way at Kathy Lane Town of Anytown, NY Date: 9 / 30 / 01
Investigator: Chip Seals Roadway Maintenance Foreman
Scale: Not to Scale
3' x 5' box w/headwalls, 0'
412" - POLE #36
APPROX. NORTH
Kathy Lane16" wide, CL = 367'
380'
Three15" Pines
330' Approx. PT335' POLE #35
330'
240'
228' - 18" dia. oak225' - POLE #34
208' - Bridge rail ends
180' - Approx. PC
145' - Bridge Joint
110' - Bridge Joint
165' - POLE #33A
62' - Approx. PT
49' - POLE #32
50' - Bridge Rail starts
(2) 11' asphalt lanes, 2' +/- gravel shoulders
18" dia. oak
Key:
Utility Pole Sign Evergreen Tree Broadleaf Tree Point of Curvature Point of Tangency
PC
PT
Collision Diagrams
• Identify common crash types or conditions
• Need police crash reports to construct
• May require several years of crash records
Crash Mapping
Right-angleRear-endRun-off-roadLeft turnPedestrianHead-on
Priority
SEVERITY
FREQUENCY
Frequent Occasional Rare
Fatal URGENT HIGH MEDIUM
Serious HIGH MEDIUM LOW
Minor MEDIUM LOW LOW
Collision Into Portable Barrier
= postcrash direction of travel
1996 Freightliner tractor and flatbed semitrailer impact and overrun median barrier.
Tractor and semitrailer
Tractor and semitrailer separate, causing trailer to encroach into northbound traffic lanes.
Tractor Semitrailer
Final Rest of 1996 Freightliner
Chevrolet collides with semitrailer followed by secondary impacts with median barrier.
= postcrash direction of travel
SemitrailerTractor
Chevrolet
Final Rest of Chevrolet SUV
Time to react to a perceived hazard
• Two seconds is a minimum.
Engineering
“Altering the environment to reduce risk and chance taking”
• Safer car design• Road design• Separating vehicles and pedestrians• Traffic management systems• Emergency response
Driving Safety Improvements
• Driver characteristics
– Training and selection
– Driver adaptation and risk calibration
– Regulatory compliance• Vehicle characteristics
– Sensing and warnings• Protective devices
Driver adaptation and risk calibration
• The design of vehicle performance improvements, such as antilock brakes, may make the driver adjust the driving speed to maintain the same perceived risk (risk homeostatis).
• The design of protection features, such as widening highways from 2 to 4 lanes, has a positive effect on safety.
Sensing and warnings
• High-mounted brake lights
• Some direct sensors of the rate of closure with the leading car
Protective devices
• Failure to use shoulder/lap seat belts is associated with a 40% increase in fatalities.
• Air bags have a similar protective value.
• The most critical factor contributing to driver survival after a crash is the time from the crash scene to an emergency room.
Road designDefine engineer’s role in designing, operating, and maintaining safe intersections.
Engineer’s Role• Challenges
– Safety vs. efficiency– Uniformity vs. flexibility in design & operation– Proactive vs. reactive in addressing safety– Global vs. local scope of solution
Engineering For Safety• Problem Identification
• Special users: older drivers, trucks, peds
Facility Type
Existing New
Objective Mitigation. Prevention.
Evidenceof Problem
Input from police & public. Safety audit.(comparison with standards)
ConfirmProblem
Compare crash frequency withthat of other intersections.
Compare predicted crash frequencywith other alternatives.
Tools Black-spot identificationtechniques.
Crash frequency prediction models.
Enforcement
“The formal sanctions to deter risk – The formal sanctions to deter risk – taking behaviour”taking behaviour”
• Fines & imprisonmentFines & imprisonment• InsuranceInsurance• Minimum safety standardsMinimum safety standards• Name & shameName & shame• Driver Improvement SchemeDriver Improvement Scheme
Regulatory compliance
• Tickets and warnings
• Photo radar (controversial)
• When the highway speed limit was increased to 65 mph, the number of fatalities increased 10 to 16%.
• Police randomly rewarding seat-belt use by drivers with cash and coupons
General Observations of Road Safety Engineering Issues in Indonesia
• Geometry
• Junctions
• Signal Controlled Junctions
• Signs and Markings
• Pedestrian Crossing
General Observations of Road Safety Engineering Issues in Indonesia
• Geometry– Bus Stops/Vehicle Parking, stopping on main
carriageway– Landscaping, plants grow to traffic sign– Road surfacing, polishing effect
General Observations of Road Safety Engineering Issues in Indonesia
• Junctions– Geometry of major junctions, wide junction
with wide approach– Side road junctions, scene of conflicts– Right turn maneuvers on the route, serious
problem
General Observations of Road Safety Engineering Issues in Indonesia
• Signal Controlled Junctions– Incorrect arrangement, object obstructing
signal heads, inadequate inter-green.– Access to signal-controlled junctions,
uncontrolled-road access to signal controlled junctions observed
– Pedestrian facilities, high number of pedestrian fatalities
– Placement of signal posts, sited in the walking path.
General Observations of Road Safety Engineering Issues in Indonesia
• Signs and Markings– Inconsistent signing, leads to confusion and
indecision– Advance traffic sign and local directions, early
and advance traffic signing– Sign facings, too small size of letter.– Carriageway markings, badly design and
poorly laid out.
General Observations of Road Safety Engineering Issues in Indonesia
• Pedestrian Crossing– Lack of advance warning, result in more
serious injury– Lack of conspicuity– Width of pedestrian, too narrow
Upaya Meminimalkan KecelakaanUpaya Meminimalkan Kecelakaan
• Pembatasan Usia dalam pemberian SIM
• Pembatasan lama waktu mengemudi tanpa istirahat (2-4 jam)
• Ujian pengemudi
• Penggunaan sabuk pengaman
• Penyuluhan dan kampanye keselamatan lalulintas
Surat Ijin Mengemudi (SIM)Surat Ijin Mengemudi (SIM)
• SIM-D usia 16 tahun, kecepatan sepeda motor < 40 kpj
• SIM-C usia 16 tahun, kecepatan sepeda motor > 40 kpj
• SIM-A usia 17 tahun, berat kendaraan < 3.500kg
• SIM-B1 berat kendaraan > 3.500kg, punya SIM-A > 12bln
• SIM-B2 kendaraan dengan gandengan, punya SIM-B1 > 12bln
Generic Measures Beneficial to Generic Measures Beneficial to Specific Road Safety IssuesSpecific Road Safety Issues
Road Safety Issues
Classes of Initiatives
Better Enforcement
PublicEducation
Lower Speeds
Safer Roads
Occupant Protection
Safer Modes of
Travel
Planning a Safer System
Drink-driving
Speeding No Seat Belt Driver Fatigue
Drugs
Generic Measures Beneficial to Generic Measures Beneficial to Specific Road Safety IssuesSpecific Road Safety Issues
Road Safety Issues
Classes of Initiatives
Better Enforcement
PublicEducation
Lower Speeds
Safer Roads
Occupant Protection
Safer Modes of
Travel
Planning a Safer System
Young Drivers Older Drivers Motor-cycles
Bicycles Pedes-trians
H. Veh.
They are NEVER to young to learn about Traffic Safety
Final Thought
When I die, I want to die like
my grandfather – who died
peacefully in his sleep. Not
screaming like all the
passengers in his car.
- Author Unknown
Traffic SafetyTraffic Safety
TS4273 Traffic EngineeringTS4273 Traffic Engineering