China Roads Safety Improvement

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China Roads Safety Improvement iRAP China

• Zhang Tiejun
• Research Institute of Highway Ministry of
  Transport
• tj.zhang_at_rioh.cn

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China Roads Safety Improvement iRAP China

• 1 Basic information of road system and safety
  improvement in China
• 2 Traffic safety countermeasure examples
• 3 Road net of IRAP China and the traffic safety
  data

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1 Basic information of road system and safety
improvement in China
Development of China road net. By 2008,there are
more than 3730000 kilometer highways ,and there
are many high level highways in China highway net.
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1 Basic information of road system and safety
improvement in China
Increase of transportation. There are about 27
billion passenger transportation and 19 billion
tons of goods transportation in China in 2008.
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1 Basic information of road system and safety
improvement in China
High death toll of traffic accident. There are
more than 260000 traffic accidents in China in
2008 and more than 70000 peoples lost their
lives.
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1 Basic information of road system and safety
improvement in China

• Improvement countermeasure
• Perfection of road traffic safety law
• Highway Safety Improvement Project
• Road traffic safety research work
• Drumbeating and Education

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• Countermeasures have Improved the traffic safety
  condition evidently
• With the implement of Highway Safety Improvement
  Project
• There were 15 vehicles increase in 2004,but the
  traffic accidents reduced more than 20.
• Basing on the investigation of 4757 kilometer
  highways with implement of Highway Safety
  Improvement Project , 1162 vehicles had been
  forbidded to run off the roadside. The traffic
  accidents with more than 3 peoples death had been
  reduced about 46.

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• 2 Traffic safety countermeasure examples
• A systemic traffic safety countermeasure on a
  long down gradient segment
• Accident distribution character before and after
  the countermeasure

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1. A systemic traffic safety countermeasure on a
   long down gradient segment

Direction by signs
slowdown mound
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Speed limited and Direction of highway alignment
in vital segment
Overtake forbidden and the middle marking widen
in sharp curve
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Guardrail strengthen at the bottom of the long
down gradient segment and compartmentation of
vehicles in different orientation
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No death after the improvement in this segment by
now!
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Accident distribution character before and after
the countermeasure
The distribution of segments with more accidents
one year before and two years after the
improvement in a two-way highway
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• Some segments always have more accidents than
  other segments in the highway
• The complicated traffic stream character and the
  bad alignment are the main accident reason. But
  few alignment improvements were done in the
  Highway Safety Improvement Project, so some
  safety problems cannot be solved radically
• It is more important to improve the highway
  safety during the highway design.

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The accident number contrast of every small
segments in 3 phases
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• The improvement project have changed the safety
  distribution character of the highway.
• The segments with accidents went on increasing
  will be done more improvement works in the
  future?
• The segments with accidents went on debasing have
  good improvement effects . The experiences can be
  extended

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3 Road net of IRAP China and the traffic safety
data
iRAP network in China

• iRAP network in china covers Mentougou District,
  Yanqing District, Changping District, Daxing
  District, Tongzhou District of Beijing.
• The total length is 2100 km, as shown in the map.
  Including
• Expressway 300 km
• The first-grade highway 200 km
• Second-grade highway 500km
• Third-grade highway and forth-grade highway 1100
  km

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3 Road net of IRAP China and the traffic safety
data

• Traffic accident
• Traffic and traffic composition
• Highway alignment
• Roadside and access

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Traffic accident

• Traffic accident data are managed by police
  department. They are mostly used in fault
  analysis
• Highway departments also have some accident data,
  most of which are accidents with highway loss.
  There are good records in freeway, but not good
  in other highways.

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1. Traffic accident

• DifficultyWe cannot collect all of the accidents
  at any time.
• For example, some drivers drive their vehicles
  away in some single vehicle accidents with few
  loss.
• Now, the accident locations are usually a site,
  but in fact a segment.

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Traffic and traffic composition

• Traffic and traffic composition data are managed
  by highway department. Different level highways
  with different observation methods?
• Traffic of national highways are observed by
  observation station. Provincial highways are
  observed by manpower.

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1. Traffic and traffic composition

• Deficiency
• Usually, about more than 25 kilometers have a
  traffic data along a highway. But for a highway
  with many crossings, the traffic is different
  between segments in 25 kilometers .

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Highway Alignment

• Freeways have good design data
• Other highways have not design data except heavy
  repair.
• Few alignment collectionreconnaissance
• Mass alignment collectionAlignment collection
  vehicle

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1. Highway Alignment

AustraliaGISTRIC Only alignment
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1. Highway Alignment

CanadaROADWARE Alignment?video?road surface, but
have not sound
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1. Highway Alignment

• Deficiency
• Alignment precision is influenced by vehicle
  track and road surface condition.

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Roadside and access

• Collect in scene or collect from video

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1. Roadside and access

• Deficiency
• Big workload
• Collection is influenced by person subjectivity

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well corresponding relation between different
data
Factual highway location is the relation criterion
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Thanks!
Research Institute of Highway Ministry of
Transport 2009.10