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traffic engineering

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Traffic engineering
Traffic engineering
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traffic engineering

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this is a brief introduction to various traffic engineering basic characteristics which are useful in designing any corridor or passage with safety & reliability.

this is a brief introduction to various traffic engineering basic characteristics which are useful in designing any corridor or passage with safety & reliability.

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traffic engineering

  1. 1. Semester : BE - 5th Civil-A Subject : Highway Engineering Code : 2150601 Presentation On : Traffic Engineering Prepared by : Eddy Ankit Gangani eddygangani@gmail.com
  2. 2.  What isTraffic Engineering ?  Scope of traffic Engineering  Traffic System Components  Traffic Characteristics – Road User Characteristics Vehicular Characteristics Road Characteristics
  3. 3.  Traffic Engineering : It is very important that traffic flow on roads should be efficient-safe-rapid.  Traffic Engineering is the branch which deals with science of measuring traffic ,Designing & Operating system to achieve Safe& efficient movement of persons as well as goods.
  4. 4.  TrafficCharacteristics  Traffic studies & analysis  Traffic operation – control  Planning & Analysis  Geometric Design  Administration & Management
  5. 5.  Road users-drivers, pedestrians, bicyclists, and passengers  Vehicles  Streets and highways  Traffic control devices  The general environment
  6. 6. Traffic Characteristics Road User Characteristics Vehicular Characteristics Permanent- Vision,Hearing,Re action time Temporary- Fatigue,Alchohol,Illn ess,Drugs Traffic Stream Facilities Atmosphere Locality Physical Mental Psychological Environmental Attentiveness Fear Anger Superposition Knowledge Skill Experience Intelligence Literacy
  7. 7.  Physiological–Measurable and UsuallyQuantifiable  Psychological–Much more difficult to measure and quantify  • Psychological : Desired speeds Desired safety distances  • Physiological : Perception-Reaction time Visual factors Hearing  The traffic engineer must deal with elderly drivers as well as 18-year-olds, aggressive drivers and timid drivers, and drivers subject to myriad distractions both inside and outside their vehicles.
  8. 8.  Field ofVision :The most important characteristic of drivers is their ability to see!  Traffic Signs: Location, Height, Shapes, Colors  The peripheral vision field narrows, as speed increases, to as little as 100° at 20 mi/h and to 40° at 60 mi/h.
  9. 9.  Perception-ReactionTime : The second critical driver characteristic is perception-reaction time (PRT).  Detection. In this phase, an object or condition of concern enters the driver’s field of vision, and the driver becomes consciously aware that something requiring a response is present.(Perception=VisionAwareness)  Identification. In this phase, the driver acquires sufficient information concerning the object or condition to allow the consideration of an appropriate response.(Intellection- Interpretation)  Decision.Once identification of the object or condition is sufficiently completed, the driver must analyze the information and make a decision about how to respond.  Response. After a decision has been reached, the response is now physically implemented by the driver.(Volition= physical response)  d = 0.278 S.t
  10. 10. Traffic Characteristics Road User Characteristics Vehicular Characteristics Dimensions Weight Maximum Turning Radius Speed Acceleration Braking System Lighting System Vehicle Design Tyre Static Dynamic
  11. 11.  VehicleCategories : AASHTO - Four main categories  Passenger type-all passenger cars, SUVs, minivans, vans, and pickup trucks.  Buses-intercity motor coaches, transit buses, school buses, and articulated buses  Trucks-single-unit trucks, tractor-trailer, and tractorsemi-trailer combination vehicles  ▫ Recreational vehicles-motor homes, cars with various types of trailers (boat, campers, motorcycles, etc.)
  12. 12.  Braking and deceleration  Acceleration  Low-speed turning characteristics  High-speed turning characteristics  Size = Height*Width*Length  Weight  Sight Distance  Super Elevation  Curves  Capacity
  13. 13.  • High-speed turning characteristics  S : Speed km/h  R : Curve Radius m  e : Super elevation rate %  f : Coefficient of side friction
  14. 14.  Braking and deceleration  Acceleration  Low-speed turning characteristics  High-speed turning characteristics  Size = Height*Width*Length  Weight  Sight Distance  Super Elevation  Curves  Capacity
  15. 15.  Friction – Skid + Slip  Unevenness  Light Reflecting Characteristics
  16. 16.  Skid : vehicle slide without revolving  Slip : wheel revolves more than longitudinal distance along the road.(acceleration)  Factors affecting : Type of Pavement Roughness of surface Dry-wet-smooth pavement conditions Conditions of tyres Speed of vehicles Brake efficiency

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  • American associ of state highwa transpo official

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