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Office of Traffic, Safety and Technology Module 3 Devices and Materials Traffic Control Plan Development Course.

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Presentation on theme: "Office of Traffic, Safety and Technology Module 3 Devices and Materials Traffic Control Plan Development Course."— Presentation transcript:

1 Office of Traffic, Safety and Technology Module 3 Devices and Materials Traffic Control Plan Development Course

2 Office of Traffic, Safety and Technology TTC Zone Devices  All shall conform to Specs, MN MUTCD, etc.  Placed where they convey message most effectively 2 Page 3-1

3 Office of Traffic, Safety and Technology Traffic Signing  Guide Signs –Guidance through work zones –Should not interfere with necessary regulatory and warning signs –Common: Advance Notice Guide Sign Those with date Those with exact location 3

4 Office of Traffic, Safety and Technology Traffic Signing  Regulatory and Warning Signs –MN MUTCD Parts 2 and 6 –Also see handout in Section

5 Office of Traffic, Safety and Technology Traffic Signing  Supplemental Sign Plates –Separate demountable plates Have proper legend Proper letters size and series Properly fastened to sign face Same retroreflective material as sign face Sheeting oriented same as the sign face 5

6 Office of Traffic, Safety and Technology Traffic Signing  Temporary Sign Covering –Care in placement not to damage permanent sign –Avoid the use of ropes, wire fasteners or strapping –Do not apply tape to the sign sheeting surface –Do not use paper or plastic covers 6

7 Office of Traffic, Safety and Technology Traffic Signing  Sign Panel Overlays –Care in placement to preserve sign inplace  Additional Information –MN MUTCD Part 6F (Later) 7

8 Office of Traffic, Safety and Technology Business Signing  Handout from approved new language to be added to TEM Chapter 8  Be sure to check for updates 8

9 Office of Traffic, Safety and Technology Proposed TEM 8-5  Temporary Business Signing in Work Zones –Construction projects have frequently caused disruption of traffic patterns in business areas –Temporary business signs are used to improve driver guidance create safer operations reduce the impact on businesses created by construction activities and detours 9

10 Office of Traffic, Safety and Technology Proposed TEM 8-5  Location and Installation of Temporary Business Signs –Shall not interfere with permanent or construction signing –Hierarchy for sign installation Regulatory warning (permanent and construction) Guide sign 10 Page 3-4

11 Office of Traffic, Safety and Technology Proposed TEM 8-5 –Minimize multiple sign structures –Minimum distances –Not installed on freeways (are exceptions) –Funding 11

12 Office of Traffic, Safety and Technology Proposed TEM 8-5  Temporary Business Signing Plan Guidelines –District to study all local business –Estimate the extent and impact –“traffic sensitive” or “regionally sensitive” –Work with businesses 12

13 Office of Traffic, Safety and Technology Proposed TEM 8-5  Types of Temporary Business Signs –Design to guide through easy decisions –Trailblazing that is understandable –First encountered should be generic in business names 13

14 Office of Traffic, Safety and Technology Proposed TEM 8-5 –Business Access Signs 14 Page 3-6

15 Office of Traffic, Safety and Technology Proposed TEM 8-5 –Business Service Signs 15

16 Office of Traffic, Safety and Technology Proposed TEM 8-5 –Business Identification Signs 16

17 Office of Traffic, Safety and Technology Proposed TEM 8-5 –Temporary Business Guide Signs 17 Page 3-10

18 Office of Traffic, Safety and Technology Business Impact Mitigation  Purpose to: –Involve businesses more in the project development process –Keep businesses informed regarding project issues –Help businesses understand a project and its potential impacts –Mitigate construction impacts to businesses as feasible (Includes reducing and, if practical, preventing negative impacts to businesses) 18

19 Office of Traffic, Safety and Technology Business Impact Mitigation  Threshold Criteria –Substantial business impacts? –If Yes Designate a project Business Liaison Use the Business Impact Mitigation Checklist Follow the guidelines in the Guidelines section 19

20 Office of Traffic, Safety and Technology Business Impact Mitigation  Responsibilities of Business Liaison –Consult with affected businesses before and during construction –Investigate means of mitigating project impacts to businesses –Provide information to the businesses before and during construction 20

21 Office of Traffic, Safety and Technology Business Impact Mitigation  Guidelines –Use the Business Impact Mitigation Checklist –Identify Businesses Early in Scoping, identify small businesses in the project area (not just within the project termini) List potentially-affected businesses and their contact information 21

22 Office of Traffic, Safety and Technology Business Impact Mitigation  Guidelines –Contact Business Owners Provide information on the project in written format Provide contact information for the Business Liaison Work with businesses to identify potential concerns, and determine preferred methods for future project communications 22

23 Office of Traffic, Safety and Technology Business Impact Mitigation  Guidelines –Identify Potential Impacts Determine the resources needed to identify and evaluate potential impacts Does the project have unique characteristics? businesses in the area have any unique issues? Is there a need for specific expertise? Does the project scale warrant extra resources? 23

24 Office of Traffic, Safety and Technology Business Impact Mitigation  Guidelines –Contact Local Governments Consult with city and county governments to identify potential impacts and discuss potential mitigation measures –Contact MN Dept. of Employment and Economic Development Assistance in determining a list of business- development organizations that may offer resources to affected businesses 24

25 Office of Traffic, Safety and Technology Pavement Markings in TTC  Definitions –Final Pavement Marking The pavement marking that will be installed until the next time the pavement marking is scheduled to be renewed (typically one or more years). Final markings would include full length centerline markings, edgelines and messages 25 Page 3-17

26 Office of Traffic, Safety and Technology Pavement Markings in TTC  Definitions –Temporary Pavement Marking the pavement marking that will be installed in staged long-term temporary traffic control zones The temporary markings will either be removed or covered with another pavement surface prior to the application of the final markings The temporary markings would include full length centerline markings, edgelines and messages. All temporary pavement markings shall be in conformance Part 6 and Part 3 of the MN MUTCD 26

27 Office of Traffic, Safety and Technology Pavement Markings in TTC  Definitions –Interim Pavement Marking any pavement markings that are not the final marking or is temporarily placed for staging purposes –Temporary Raised Pavement Marker (TRPM) retroreflective pavement markers applied to the roadway surface which maintain retroreflective properties during wet weather conditions TRPMs are used alone to substitute for pavement marking segments or to provide wet weather capabilities to other pavement markings 27

28 Office of Traffic, Safety and Technology Pavement Markings in TTC  Interim Marking Guidelines –Projects greater than 1.25 miles in length use the same cycle length as final pavement markings minimum of 2 feet in length –Projects >350 feet, < 1-1/4 miles in length Match the cycle length on either end See Figure 6F-8a and 8b of MN MUTCD 28

29 Office of Traffic, Safety and Technology Pavement Markings in TTC  Temporary Pavement Marking Guidelines –Give traffic clear path to follow –Typically, markings for staging are temporary –Of pavement to be overlaid or reconstructed, temp tap or marking paint, or epoxy can be used 29

30 Office of Traffic, Safety and Technology Pavement Markings in TTC  Wet Retro-reflective Properties –Retains retroreflectivity, presence, and color when wet or submerged in water –Consist of Solid temporary pavement marking tape lines supplemented with TRPMs (temporary raised pavement markings) or Solid temporary wet retroreflective pavement marking tape lines or Solid pavement marking paint or epoxy lines supplemented with TRPMs (temporary raised pavement markings) or Solid wet retroreflective pavement marking paint or epoxy lines 30 Page 3-19

31 Office of Traffic, Safety and Technology Pavement Markings in TTC  Final Pavement Markings –Refer to TEM Chapter 7  Temporary Raised Pavement Markings –May be used to simulate solid lines –See Standards for TRPMS on APL/QPL 31

32 Office of Traffic, Safety and Technology Pavement Markings in TTC  Temp. Pavement Markings Tech Memo –TM T-02 –Provide an appropriate pavement marking on all highways, 365 days per year –An appropriate pavement marking is one that meets or exceeds the standards defined in the MN MUTCD –During winter weather events, pavement markings should provide presence after pavement is clear of snow and ice 32

33 Office of Traffic, Safety and Technology Pavement Markings in TTC  Pavement Marking Removal Scarring –Removed marking can be confusing –Overly aggressive techniques can leave scars 33

34 Office of Traffic, Safety and Technology Pavement Markings in TTC  Spec Book on Pavement Marking Removal 34

35 Office of Traffic, Safety and Technology Pavement Markings in TTC  Special Provisions 35

36 Office of Traffic, Safety and Technology Channelizing Devices  Classified into 3 types –Type A –Type B –Type C 36

37 Office of Traffic, Safety and Technology Channelizing Devices  Quick Reference Chart 37

38 Office of Traffic, Safety and Technology Temporary Traffic Barriers  A number of temporary barriers are used for temporary traffic control –www.dot.state.mn.us/products/temporarytra fficcontrol/temporarybarriers.htmlwww.dot.state.mn.us/products/temporarytra fficcontrol/temporarybarriers.html 38

39 Office of Traffic, Safety and Technology Temporary Traffic Barriers  Proper temporary barrier system selection and design involves the consideration of a number of specific factors –NCHRP Report 350 –Duration and ease of installation, maintenance, and removal –Exposure and safety risks for workers and road users –Expected frequency and severity of impacts –Available space for barrier installation and lateral deflection 39

40 Office of Traffic, Safety and Technology Temporary Traffic Barriers  MN MUTCD Section 6F.85, five primary functions –To keep motor vehicle traffic from entering work areas, such as excavations or material storage sites; –To separate workers, bicyclists, and pedestrians from motor vehicle traffic; –To separate opposing directions of motor vehicle traffic; and –To separate motor vehicle traffic, bicyclists, and pedestrians from the work area such as false work for bridges and other exposed objects; and –To protect drop-offs of greater than 12 inches on longer term projects when a suitable buffer lane cannot be provided 40

41 Office of Traffic, Safety and Technology Temporary Traffic Barriers  Crashworthiness –Crashworthy Characteristic of roadside devices that have been successfully crash tested in accordance with a national standard such as the National Cooperative Highway Research Program Report 350, “Recommended Procedures for the Safety Performance Evaluation of Highway Features All temporary traffic control devices shall be crashworthy FHWA requires successful crash testing in accordance with the NCHRP Report 350 or AASHTO MASH 41

42 Office of Traffic, Safety and Technology Temporary Traffic Barriers  Crashworthiness –Key Points of MASH All new testing will be done following MASH evaluation techniques Hardware accepted under NCHRP Report 350 is appropriate for replacement and new installation –Retesting is not required As of January 1, 2011, all new products must be tested using MASH crash test criteria for use on the National Highway System (NHS) 42

43 Office of Traffic, Safety and Technology Temporary Traffic Barriers  Anchoring –To control or eliminate lateral deflection close to pavement edge drop-offs and in other situations where deflection space is limited, barrier sections may be anchored to the pavement –Bridge Department has a memo, “Interim Guidance for Installation of Temporary Barriers on Bridges and Approach Panels” 43

44 Office of Traffic, Safety and Technology PPCB  Majority of temporary barriers used in Minnesota are portable precast concrete barriers  MN MUTCD for Info 44

45 Office of Traffic, Safety and Technology Moveable Barrier  Source: Barrier Systems Inc. 45

46 Office of Traffic, Safety and Technology Portable Non-Concrete Barrier  PPCB is the most widely used positive protection device in use today  PPCB does have a low initial cost and are readily available  They also are quite heavy and creates issues when required on a bridge project and during transport  Other barrier systems (such as steel) are available  Generally higher upfront cost 46

47 Office of Traffic, Safety and Technology Water Filled Barrier  Water-filled barrier in APL  Barriers shall be certified by the FHWA as meeting or exceeding the requirements of the NCHRP 350  The installer shall install according to the manufacturer's installation instructions 47

48 Office of Traffic, Safety and Technology Barrier End Treatments  Upstream leading ends that are present shall be appropriately flared or protected with properly installed and maintained crashworthy cushions 48

49 Office of Traffic, Safety and Technology Barrier End Treatments  Crash cushions –systems that mitigate the effects of errant vehicles that strike obstacles, either by smoothly decelerating the vehicle to a stop when hit head- on redirecting the errant vehicle  A typical barrier end treatment can be found at, –http://www.dot.state.mn.us/trafficeng/workzone/do c/PCBendtreatment.pdfhttp://www.dot.state.mn.us/trafficeng/workzone/do c/PCBendtreatment.pdf 49

50 Office of Traffic, Safety and Technology Truck Mounted Attenuators  Energy-absorbing devices attached to the rear of shadow trailers or trucks  When used, the shadow vehicle with the attenuator is located in advance of the work area, workers, or equipment to reduce the severity of rear-end crashes from errant vehicles  Vehicle is positive protection for the workers and the attenuator is positive protection for the driver 50

51 Office of Traffic, Safety and Technology Surface Mounted (Centerline) Delineators  Devices that may be used as center lane dividers 51 Page 3-29

52 Office of Traffic, Safety and Technology Portable Changeable Message Signs (PCMS) 52

53 Office of Traffic, Safety and Technology Portable Signal Sytems  Portable Traffic Control Signals are either Trailer Mounted or Pedestal Mounted  Approved products and specifications for portable signal systems can be found on the APL 53

54 Office of Traffic, Safety and Technology Automated Flagging Assist Device  Enable the operator to be positioned out of the lane of traffic  Capable of displaying a STOP message followed by a SLOW message without the need for a flagger  Can be remotely operated by a one operator  Single operator may only be used on roadways with unobstructed sight lines, less than 1500 ADT, and less than 1000 feet between the devices 54

55 Office of Traffic, Safety and Technology Flashing Arrow Boards  Part 6 of MN MUTCD  See APL/QPL 55

56 Office of Traffic, Safety and Technology Crash Cushions and Attenuators  Non-Redirective (Gating)  Redirective (Non-Gating) 56

57 Office of Traffic, Safety and Technology Ballast  Sandbags are the most common ballast  Should be constructed of a material which will allow the bag to break and disperse  Other ballasting systems may be used on some temporary traffic control devices provided they are crashworthy. 57

58 Office of Traffic, Safety and Technology Approved/Qualified Products (APL/QPL)  list of approved products 58

59 Office of Traffic, Safety and Technology MN MUTCD  6F.1 Types of Devices  6F.2 General Characteristics of Signs  6F.3 Sign Placement 59

60 Office of Traffic, Safety and Technology MN MUTCD 60

61 Office of Traffic, Safety and Technology MN MUTCD 61

62 Office of Traffic, Safety and Technology MN MUTCD  6F.4 Sign Maintenance  6F.5 Regulatory Sign Authority  6F.6 Regulatory Sign Design  6F.7 Regulatory Sign Applications  Refer to other section in MN MUTCD 62

63 Office of Traffic, Safety and Technology MN MUTCD  Type A Channelizing Devices –Figure 6F-7 63

64 Office of Traffic, Safety and Technology MN MUTCD  6F.77 Pavement Markings –Figure 6F-8a 64

65 Office of Traffic, Safety and Technology MN MUTCD 65

66 Office of Traffic, Safety and Technology MN MUTCD  6F.85 Temporary Traffic Barriers 66

67 Office of Traffic, Safety and Technology MN MUTCD  6F.86 Crash Cushions  6F.87 Rumble Strips  6F.88 Screens 67


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