New Trends In Temporary Traffic Control (TTC) Spring Occupational Safety & Health Committee Conference Philadelphia, PA

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1 New Trends In Temporary Traffic Control (TTC) Spring Occupational Safety & Health Committee Conference Philadelphia, PA

2 Michael Kelly Work history - Fire service member of 30 years (retired at the rank of Battalion Chief and Training Officer) - Owner of START Group for over 30 years - Member of the NCUTCD for over 12 years Work experience - Emergency preparedness trainer for Midwest Generation/NRG for over 15 years - Trainer of TTC and other OSHA related topics for power generation, transmission, and distribution companies and contractors throughout the nation - Contractor of choice for Commonwealth Edison for transformer confined space rescue services 2

3 Worker Challenges for Safe TTC Distracted drivers Increased congestion on the roadways Difficult areas to complete work Increase in age of drivers 3

4 Solutions to TTC Challenges Worker level - Increased visibility - Increase awareness of vulnerability Safety/Management level - Utility driven policies - Increased training - TTC audits New product level - Synchronized lighting - Quick reference guide - Signs (attached to vehicles or TIM functions) - Portable rumble strips 4

5 Regulations That Influence TTC MUTCD OSHA State DOT Guidelines from organizations (i.e., ATSSA, ITE, AASHTO) Specific company regulations Best practices established for different work groups 5

6 MUTCD Levels of Compliance Shall STANDARD Should GUIDELINE May OPTION Additional Information SUPPORT 6

7 Safety/Management Challenges for Safe TTC Establishing company specific procedures and best practices that are practical and appropriate for each work group Training personnel on the MUTCD concepts and these company specific procedures and best practices Equipping vehicles with hardware to complete these best practices Securing the buy in of line supervisory personnel Establishing a process to audit compliance of performance in the field 7

8 Fundamental Concepts of TTCZ The entire section of roadway between the first advance warning sign through the last traffic control device, where traffic returns to its normal path. 8

9 Component Parts of a TTC Zone Traffic Space Work Space Buffer Space Termination Area Activity Area Transition Area Advance Warning Area

10 Advance Warning System Warning signs to - Draw attention - Warn about the situation ahead - Inform of actions to take Diamond-shape signs = WARNING! 10

11 Transition Required for lane closures Traffic is moved from the normal travel lanes May contain various types of tapers Will discuss tapers later 11

12 Activity Area 3 Sub-components - Buffer spaces Longitudinal Lateral - Work space - Traffic space 12

13 Traffic Space Not to scale Work Space Buffer Space Activity Area

14 Longitudinal Buffer Space Recovery area for errant vehicles Protects workers ALWAYS empty: No vehicles, equipment or materials allowed STRONGLY RECOMMENDED: Use unless there is a documented reason not to 2009 MUTCD: If a longitudinal buffer space is used, the values shown in Table 6C-2 may be used. (6C-11) 14

15 Table 6C-2. Stopping Sight Distance as a Function of Speed Speed (mph) L. Buffer (ft.) Speed (mph) L. Buffer (ft.) (Use for Longitudinal Buffer Spaces)(6C-11) 15

16 Lateral Buffer Space No set distance or table Case-by-case Engineering judgment Lateral buffer 16

17 Work Space Where the work takes place - Workers - Equipment and materials - Work vehicles - Maneuver room - Truck-mounted attenuator 17

18 Traffic Space The space open for road users to pass safely 18

19 Termination Area End of TTCZ Resume normal driving May contain (optional): - END ROAD WORK - Downstream taper Min. 100 ft. per lane reopened 19

20 Termination Area Not to scale

21 What is a Taper? A series of channelizing devices (and sometimes pavement markings) placed on an angle to move traffic out of its normal path A gradual increase or decrease A gradual transition 21

22 Tapers in TTCZ Created using channelizing devices to move traffic form its normal path May be used both in the transition and termination areas 22

23 Types of Tapers in the Advance Warning System Merge Shift Shoulder 23

24 Merge vs. Shift Tapers Lane closures Requires merging No lane is closed No merging but rather a shift Both have MINIMUM lengths! 24

25 One-Lane, Two-Way Taper Flagging taper 50 MIN 100 MAX TA 10 25

26 Why are Two-Lane Roads a Special Case? They are treated differently: - Short tapers to encourage drivers to slow or stop feet Formulas do not apply! - Do not use arrow panels - Flagging operation 26

27 Taper Lengths Merging Taper Shifting Taper Shoulder Taper One-Lane, Two- Way Taper Termination Taper L MIN. ½ L MIN. 1/3 L MIN. 50 MIN. 100 ft. MAX. (DO NOT USE FORMULAS!!) 100 ft. MIN. (per lane reopened) 27

28 Formulas for Min. Length (L) of a MERGING Taper L = WS (45 mph or more) L = (WS 2 )/60 (40 mph or less) Where: L = length of the MERGING taper in ft. W = width of lateral displacement in ft. S = Speed in mph 28

29 S = Which speed? The speed could be: - Posted speed (MIN!) - Off-peak 85th percentile speed prior to work starting, or - The anticipated operating speed Prevailing speed Not necessarily the posted speed! 29

30 What is the 85 th Percentile Speed? The speed at which at least 85 percent of the traffic is traveling, or below Can be computed graphically Usually 8-10 mph above the posted speed 85 th what? 30

31 Minimum MERGING taper (L) length in feet S <

32 Termination: Maximum Spacing = 20 Tangent: Maximum Spacing = Speed X 2 Taper: Maximum Spacing = Speed

33 Maximum Spacing of Channelizing Devices Depends on whether in: - Taper - Tangent (after the taper) - Other factors Curves Road topography Arterial roads Traffic and pedestrian pattern DEVICE SPACING 33

34 Maximum Channelizing Device Spacing On a Taper Spacing of devices should not exceed a distance in feet equal to the POSTED speed Example: 55 mph - Max spacing of devices on taper = 55 ft. 34

35 Maximum Channelizing Device Spacing On a Tangent Spacing of devices should not exceed a distance in feet equal to TWICE the POSTED speed Example: 60 mph - Max spacing of devices on tangent = 120 ft. 35

36 Spacing of Devices on Tapers For a one-lane, two-way and a downstream taper, MAXIMUM spacing between devices equals feet. Typically 6 devices, feet apart

37 Determining the Minimum Number of Devices Needed Example: - Length = 100 feet - Spacing = 20 feet apart So how many devices are needed? Is there a formula? 37

38 Determining the Minimum Number of Devices Needed MIN. Number of devices = Length of devices + 1 Spacing = = 6 devices

39 What are Traffic Control Devices? Things used to implement a TCP in the field Objects motorists see and respond to when they drive through a TTCZ - Shall be approved in the MUTCD 39

40 Purpose of Traffic Control Devices Ensure highway safety by providing for the orderly and predictable movement of traffic and provide the guidance and warning necessary for road users to get through the work zone safely. 40

41 Requirements of Traffic Control Devices Fulfill a need Command attention Convey a clear, simple meaning Command respect of road users Give adequate time for proper response 41

42 Signs Familiar to users Provide a good deal of information to road users Convey messages through - Colors & shapes - Words & symbols 42

43 Sign (Background) Color Code Yellow: General Warning Red: Stop or Prohibition Blue: Motorist Services Guidance Green: Direction Brown: Recreational/Cultural Interest Orange: Temporary Black/White: Regulatory Fluorescent Yellow-Green: Ped/Bike Fluorescent Pink: Incident Management 43

44 Fluorescent Pink May be used for Incident Management signs Optional 44

45 Retroreflective Signs Reflect light back to the source Retro = back Reflective Retroreflective 45

46 Principle of Retroreflectivity Light to driver Retroreflective sheeting Light from headlamp Sign 46

47 Non-Retroreflective Signs Disappear at Night 47

48 Sign Dimensions The higher the speed, the larger the sign 48

49 Minimum Sign Dimensions High-speed roadways: - 48 x 48 Moderate speed/volume: - 36 x 36 Secondary roads and city streets: - 24 x Check local standards! 49

50 Sign Location Usually on right side of road May be placed on left side for special emphasis 50

51 Sign Spacing Increases with speed Depends on the type of road - Urban - Rural - Expressways and freeways 51

52 A B C 52

53 Suggested Advance Warning Sign Spacing Road Type A B C Urban (low speed*) Urban (high speed*) Rural Freeways and Expressways 1,000 1,500 2,640 *Speed category to be determined by highway agency

54 Channelizing Devices Cones Tubular Markers Vertical Panels Drums Barricades 54

55 Channelizing Devices Serve To: Delineate Protect workers Guide drivers and pedestrians safely Channelize traffic 55

56 The Stripes Tell the Way! This way! 56

57 Barricades Control Traffic By: Closing Restricting Delineating all or a portion of the road 57

58 Types of Barricades TYPE I TYPE II TYPE III The number of retroreflective rails equals the barricade type! 58

59 Direction Indicator Barricades 2009 MUTCD approved - Built-in warning light - Built-in ballast - Configurable panels Battery compartment is LOW! 59

60 Flashing and Steady Burn Steady burn for delineation Flashing to draw attention to an object or hazard Movement (flash) draws your attention! 60

61 Synchronized Warning Lights on Channelizing Devices 2009 MUTCD approved - Synchronized warning lights on channelizing devices - Configuration choices - Must be consistent in the application 61

62 Arrow Boards A supplemental device - Should be used in addition to appropriate signs, barricades, or other traffic control devices 62

63 Arrow Board Minimum Mounting Heights Trailer: 7 feet above the roadway Vehicles: as high as practicable 63

64 Arrow Board Modes of Operation Flashing Arrow Sequential Arrow Sequential Chevron Flashing Double Arrow Flashing Caution 64

65 Use of the CAUTION Mode for Shoulder Work

66 Preferred Arrow Board Location For a stationary lane closures should be located on the shoulder at the beginning of the taper 66

67 Arrow boards SHALL NOT be used on a two-lane, two-way roadway for temporary one-lane operation!! 67

68 Test Results: Sound and Vibration: TPRS generates more vibration than adhesive strips Matches levels of ground-in rumble strips Sound: More sound than adhesive strips Vibration Compares well with ground-in rumble strips University of Kansas Study, Lawrence KS, May, 2009

69 Test Results: Speed Reduction Tested in 7 Work Zones mph speed reductions Ohio University Study, Athens OH, USA, 2010 Conclusion: will improve safety in Work Zones

70 Kansas TPRS Results US 50 May- June Highway 9 Deaths 6 Weeks 7 Years Later 22 mile asphalt paving project Zero fatalities Zero crashes

71 The TXDOT Evaluation Highway 64, near Tyler TX Road-widening project; flagger, pilot car operation Avg. 3 accidents per week, due to distracted drivers We haven t seen an accident since we put the rumble strips up last July. They have made a lot of difference.

72 Applications Any Utility Operations where you want to protect the life of your employees

73 ANSI Requirements for High-Visibility Apparel ANSI 107, American National Standard for High- Visibility Safety Apparel ANSI 207, American National Standard for High- Visibility Safety Apparel Included in 2009 MUTCD 73

74 Class 3 Apparel For use where - Speeds above 50 mph - Wide range of weather conditions - Exceeds to 1,000 ft. MUTCD visibility requirement Recommended for nighttime flagging! 74

75 MUTCD Categories of Work Duration Long-Term Stationary Intermediate-Term Stationary Short-Term Stationary Short Duration Mobile 75

76 Long-Term Stationary The project occupies a location for more than 3 days 76

77 Intermediate-Term Stationary Work that occupies a location more than one daylight period up to 3 days, or Nighttime work lasting more than 1 hour 77

78 Short-Term Stationary Daytime work, from one to twelve hours 78

79 Short-Duration Work that occupies a location for up to one hour 79

80 Mobile Work that moves: - Intermittently = mobile Trash pickup Surveys Mowing - Continuously = moving Striping Installing rumble strips 80

81 Roadway Type Urban Streets low speeds, low volumes. Urban Arterial Roads low speeds, high volumes. Intersections low speeds, high volumes, complex situations. Rural Two-lane Roadways high speeds, low volumes. Rural/Urban Multilanes high speeds, high volumes. Freeways high speeds, high volumes. 81

82 MUTCD Locations of Work Outside the shoulder On the shoulder with no encroachment On the shoulder with minor encroachment Within the median Within the travel way 82

83 Installing Stationary Lane Closures 1. Lay out the traffic control - Determine the beginning of the work space. - Measure: Buffer space Taper length Shoulder taper, if used Advance warning sign spacing 83

84 Installing Stationary Lane Closures 2. If post-mounting signs, call for utility locates 84

85 Installing Stationary Lane Closures 3. Install the first sign(s) motorists will see. Proceed downstream ( with the flow of traffic ) Cover inapplicable signs 85

86 Installing Stationary Lane Closures 4. Install the shoulder taper, if used 5. If required, place an arrow panel on the shoulder at the beginning of the merging taper 86

87 Installing Stationary Lane Closures 6. Place channelizing devices at the required spacing (speed limit in feet) for the appropriate distance to form the transition area taper 87

88 Installing Stationary Lane Closures 7. Install devices at the appropriate spacing to form the buffer space 8. Continue placing devices at the appropriate spacing through the work space moving downstream 88

89 Installing Stationary Lane Closures 9. If required, place devices 20 feet apart to create a 100-foot long downstream termination taper. 89

90 Installing Stationary Lane Closures 10. If required, install the END ROAD WORK SIGN 11. Drive-through inspection - A night inspection is needed for night work 90

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103 Closing Comments Questions Mike Kelly Startgrouptraining.com 103

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