1. Traffic Control Devices
Presented By: Team Hawaii

2. 5 Basic Needs: Fulfill a need Command attention
Command respect from roadway users
Convey clear and simple message
Give adequate time for proper response

3. Purpose: Promote highway safety and efficiency
Notify road users of changes and regulations
Provide guidance for changes and minimize incidents

4. Types of Devices
Signs
Signals
Markings
Delineators
Barricades
Other

5. Placement Uniform and consistent
Shall be authorized by the public agency or official having jurisdiction (i.e. _DOT)
Federal minimum can be found in the MUTCD Typical Applications and respective tables (Chapter 6F)

6. Signs Regulatory Signs Warning Signs Guide Signs Dimensions
Applications
Requirements

7. Regulatory Signs Reinforces traffic laws and regulations
Requires authorization from regulatory agency
Size and color standards determined regulatory authority
Color: black, white and red

8. Warning Signs
Indicates warnings to road user of conditions on or near the road
Placed in advance of hazardous condition
Generally diamond shaped
Color
If permanent= black on yellow
If temporary= black on orange

9. Guide Signs Provide road users with guidance during travel
Include, but are not limited to:
Route signs
Destination/Distance signs
Toll Signs

10. Guide Signs
Colors include:
Green
Blue
Brown
Purple

11. Dimensions/Applications/Requirements
Sign dimensions regulated by MUTCD and derived by posted speed
Placement
Right side of road, generally
Both sides of road if median allows
Permanent signs: 7’ off ground
Temporary signs: 1’ off ground

12. Dimensions/Applications/Requirements Cont.
Retroreflectivity
Increases night time visibility
Required for permanent signage
Required for temporary night signage
Not required for temporary day time signage

13. Arrow Boards
Shall provide additional warning and directional information.
Assist in merging and controlling traffic in work zones using TTC
Requirements found in MUTCD Part 6
Chevrons are acceptable, but arrows are preferred

14. Message Boards (PCMS) Portable Changeable Message Signs
Best used in areas with heavy traffic and/or difficult/variable road conditions
Found to have better response to roadway users than advanced warning signs
Best to pair with advanced warning signage
Message must be clear and simple

15. Channelizing Devices and Delineators
Cones
Drums
Tubular Markers
Vertical Panels
Barricades
Type I
Type II
Type III

16. Cones Predominantly Orange Minimum height Daytime- 18”
Night time- 28”, but may be 36”- check with jurisdiction
At night, must be retroreflectorized
4”-6” wide white stripes
Min. 2 white and 2 orange stripe, with orange stripe on top

17. Drums Generally used on highways and freeways
Constructed of lightweight, deformable materials.
Metal drums are prohibited
Min. 36” height and have at least an 18” min. width regardless of orientation

18. Drums
Min. 2 white and two orange 4”-6” retroreflective stripes required
Ballast shall not be placed on the top of the drum

19. Tubular Marker
Limited visibility to driver and should only be used where space restrictions do not allow for other devices
Predominantly Orange

20. Tubular Marker Minimum height Daytime, low speed- 18” tall
Highway/Freeway- 28” tall
Night time- 42”
2” wide facing road users
Retroreflectorization with four 4”-6” wide alternating orange and white stripes, with orange on top

21. Vertical Panels Where space is limited, may be used to:
Channelize vehicular traffic
Divide opposing lanes
Replace barricades

22. Vertical Panels
Shall have retroreflective striped material that is 8”-12” in width and at least 24” in height
Alternating orange and white retroreflective stripes slope down at an angle of 45 degrees in the direction of traffic

23. Type I,II, and III Barricades
Portable or fixed device
Has one to three rails with appropriate markings
Used to:
Control road users
Restrict
Delineate all or a portion of the right-of-way

24. Type I,II, and III Barricades
Stripes shall slope downward at an angle of 45 degrees toward the direction road users are going to pass

25. General Delineator Rules
Retroreflective required at night
Yellow is when used to channelize traffic in opposite directions
Face chevrons towards direction that traffic will travel

26. General Delineator Rules
Always look at specific jurisdiction to see requirements
Utilize barrier lights (i.e. Steady Burns) for night operations

27. Temporary Traffic Barriers
Types of Barriers
K-rail/Jersey Barrier
Street Rail
Triton Barrier/Water filled

28. Temporary Traffic Barriers
4 Primary functions
To keep vehicular traffic from entering work zone
To separate workers, bicyclists, and pedestrians from motor vehicle traffic
To separate opposing directions of vehicular traffic
To separate vehicular traffic, bicyclists, and pedestrians from exposed objects (i.e. false work)

29. Crash Cushions Formally known as attenuators
Purpose: To eliminate blunt ends of barriers and lessen impact
Types of crash cushions:
Redirective
Non-redirective (i.e. Absorb 350)
Truck mounted attenuators
Always read manufacture's specifications and know product’s clear zone

30. Crash Cushions Cont. Considerations when choosing:
Permanent, work zone, or specialty?
Clear zone of specific attenuator
Posted speed of travel way
Cost

31. Pavement Markings Permanent Markings:
Indicate the separation of lanes for roadways users
Assist the bicyclist by indicating assigned travel paths
Provide advance information for turning and crossing maneuvers
Temporary Markings
Must be replaced during construction
See project contract for required specification

32. Pavement Markings Cont.
Normal line- 4”-6” wide
Markings shall be:
Yellow: Separate traffic traveling in oppose direction
White: Right hand edge of roadway
Raised Red Markers: One-way roadways, ramps, or travel lanes that are not to be crossed
Blue: supplement white markings for parking for ADA areas
Purple: Supplement lane or edge line marking toll plaza approach lanes.

33. Rumble Strips
Transverse areas of rough-textured or slightly raised or depressed road surface
Purpose: Alert drivers to unusual vehicular traffic conditions
Through noise and vibration they attract the drivers attention to such features
Should not be placed on sharp horizontal or vertical curves
Should not be placed through pedestrian crossings or bicycle routes

34. Screens AKA: “Gawk” Screens
Purpose: Block the road users’ view of activities that can be distracting and reduce headlight glare from oncoming motor vehicle traffic
Design should be in accordance with Chapter 9 of AASHTO’s “Roadside Design Guide”

35. References
Manual on Uniform Traffic Control Devices for Streets and Highways. [Washington, D.C.]: U.S. Dept. of Transportation, Federal Highway Administration, Print.
Roadside Design Guide. Washington, D.C.: American Association of State Highway and Transportation Officials, Print