Positive guidance principles
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Positive Guidance Principles. Positive guidance concept. Provide drivers sufficient information about roadway design, operations, and potential hazards so they respond correctly and avoid crashes. CE 552 objectives related to PG. Identify problems

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Positive guidance concept

  • Provide drivers sufficient information about roadway design, operations, and potential hazards so they respond correctly and avoid crashes


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CE 552 objectives related to PG

  • Identify problems

    Crash data, complaint files, site diagrams

  • Analyze driver tasks / performance

    On-site speed and driver studies

  • Assess the current information system

    Road safety audits a portion of this

  • Develop and evaluate improvements or modifications to the information system


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Driving Task Components

  • Navigation

  • Guidance

  • Control

  • Class - what are the elements of each?


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Navigation components

  • Route selection

  • Distance to destination

  • Interchange / route change locations

  • Directions of roadways

  • - i.e. general elements associated with trip planning


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Guidance

Vehicle operator is in decision mode regarding lane placement, speed and more while considering existing:

  • Horizontal and vertical alignment

  • Roadway cross sections

  • Roadside obstacles

  • Traffic signage / controls

  • Traffic features - volume _ speeds


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Control

  • Driver in reactionary mode

  • receives input from senses relating to vehicle handling

  • superelevation

  • pavement texture

  • speed / acceleration


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Examine Guidance sectionTraffic controls and human factors

  • D_R_D_R related to information or control signs

  • 1) D R D R distances

  • 2) Ability to read and recall information / driver visual acuity

  • 3) Primacy

  • 4) Expectancy

  • 5) Redundancy


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Principle of Primacy

  • concept of primacy asserts that at any given

    moment, some information is more important than other information.

    Control information is more important than guidance information

    Guidance information is more important than navigation information.

    Information about some hazards is more important than information about other hazards.


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Principle of Expectancy

  • Expectancy affects the perception and use of information. People expect certain things to appear and operate in certain ways.

  • Where do expect to find the light switch?

    Move switch up or down to turn light on?

  • Hot water on left or right?

    Turn clockwise or counter-clockwise to shut water off? (Tougher question )


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Principle of Expectancy

  • Hot water on left or right?

  • Turn clockwise or counter-clockwise to shut water off? (Tougher question )


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Principle of Expectancy

How does this relate to highway safety design and controls?

Exit ramps - _______

Color red - ________

Curve sign or turn sign - _______________

Chevron to indicate lane shift - ___________


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Principle of Redundancy

Recognize that different driver’s pick up cues in different ways AND short term memory is short, additional input is needed

Example:

Redundancy by _________________



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