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Traffic Signs

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... letters or symbols, and a short legend for quick comprehension ... sign ... 20080821. Traffic Signs. 25 / 21. Traffic Signs. Thank You. tomvmathew_at_gmail.com ... – PowerPoint PPT presentation

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Title: Traffic Signs


1
Traffic Signs
  • CE740 Traffic Engineering

2
Introduction
  • Traffic control devices
  • Medium of communication between traffic engineer
    and road users
  • Major types
  • Traffic signs
  • Road markings
  • Traffic signals
  • Parking control

3
Traffic control devices
  • Purpose
  • to promote highway safety and efficiency by
    providing for the orderly movement of all road
    users
  • Traffic control devices notify road users of
    regulations and provide warning and guidance
    needed for the reasonably safe, uniform, and
    efficient operation of all elements of the
    traffic stream

4
Traffic control devices
  • Traffic control devices or their supports shall
    not bear any advertising message or any other
    message that is not related to traffic control.
  • Tourist-oriented directional signs and Specific
    Service signs are not considered advertising
    rather, they are classified as motorist service
    signs

5
Traffic control devices
  • Principles
  • Fulfill a need
  • Command attention from road user
  • Convey clear and simple meaning
  • Avoid overuse, misusing, confusing messages
  • Adequate time for proper response
  • Uniformity of the meaning of the control devices

6
Traffic control devices
  • Communication tools
  • Color
  • easily noticed characteristics
  • red, green, yellow, black, blue, and brown
  • Shape
  • the second element discerned by the driver
  • circular, triangular, rectangular, diamond shape
  • Legend
  • Pattern

7
Traffic control devices
  • Communication tools
  • Legend
  • legend should be short, simple and specific
  • Symbols that are trans-lingual or word messages
  • Word messages should be as brief as possible
  • All lettering shall be in capital letter
  • Word messages on street name and destinations may
    include lower-case letters with initial
    upper-case letters

8
Traffic control devices
  • Communication tools
  • Pattern
  • Used in markings to complement signs
  • solid, double solid and dotted lines

9
Traffic control devices
  • Design principles
  • High visibility by day and night
  • High legibility
  • adequately sized letters or symbols, and a short
    legend for quick comprehension
  • Uniformity in design
  • include shape, color, dimensions, legends,
    borders, and illumination or retro-reflectivity

10
Traffic Signs
  • Regulatory signs
  • Mandatory signs - give notice of traffic laws or
    regulations
  • Warning signs
  • Cautionary signs - give notice of a situation
    that might not be readily apparent
  • Informative signs
  • Guide signs - show route designations, distances,
    services, points of interest, etc.

11
Regulatory signs
  • Types
  • Right of way series
  • Speed series
  • Movement series
  • Parking series
  • Pedestrian series

12
Regulatory signs
  • ROW series
  • STOP sign
  • Octagonal shape
  • to indicate traffic is always required to stop

13
Regulatory signs
  • STOP sign warrant
  • engineering judgment indicates
  • Intersection of a minor road with a major road
  • Street entering a through highway or street
  • Un-signalized intersection in a signalized area
  • High speeds, restricted view, or crash records

14
Regulatory signs
  • STOP sign placement

15
Regulatory signs
  • ROW series
  • YEILD or GIVEWAY
  • downward-pointing equilateral triangle
  • Wide red border and the legend YIELD in red on a
    white background

16
Regulatory signs
  • YEILD sign warrant
  • Ability to see all conflicting traffic is
    sufficient to allow a road user to pass through
    the intersection in a reasonably safe manner.
  • In a merging situation the entering roadway has
    poor geometry and/or inadequate sight distance
  • An intersection where a special problem exists
    which could be corrected

17
Regulatory signs
  • YIELD sign placement

18
Regulatory signs
  • Speed series- warrants
  • Road characteristics, shoulder condition, grade,
    alignment, and sight distance
  • Roadside development and environment
  • Parking practices and pedestrian activity
  • Accidents in least a 12-month period
  • Black legend on a white background
  • Circular in shape with red borders

19
Regulatory signs
  • Speed series- warrants
  • Black legend on a white background
  • Circular in shape with red borders

20
Regulatory signs
  • Movement series
  • turn prohibitions

21
Warning Signs
  • Purpose
  • Own safety of drivers
  • Extra vigilance from driver
  • Design
  • Legend will be black in color with a white
    background
  • Shape is upward triangular or diamond shape with
    red borders

22
Warning Signs
  • Examples

23
Traffic Signs
  • Informative signs
  • Predominantly meant for drivers who are
    unfamiliar to the place

24
Traffic Signs
25
Traffic Signs
26
Thank You
  • tomvmathew_at_gmail.com
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