Presentation is loading. Please wait.

Presentation is loading. Please wait.

Mn/DOT OTST Office of Traffic, Safety, and Technology.

Similar presentations


Presentation on theme: "Mn/DOT OTST Office of Traffic, Safety, and Technology."— Presentation transcript:

1 Mn/DOT OTST Office of Traffic, Safety, and Technology

2 Mitch Bartelt, PE Pavement Marking Engineer Ken E. Johnson, PE Pavement Marking and Work Zone Engineer

3 What are pavement markings? MnMUTCD Big picture Colors, patterns and widths Types of markings What are pavement markings made of? Materials used and why

4 Exciting new implementations!!! Rumble stripEs Wet-reflective Grooving Others

5 MN Statute – The commissioner shall adopt a manual … for a uniform system of traffic-control devices … for use upon highways within this state.

6 Example of importance: Up until the 1971 version of the Federal MUTCD, white was allowed as a color for centerlines in the United States. The 1971 version standardized yellow for centerlines following decades of debate.

7 Communication system for drivers Provide traffic control Provide guidance Supplement other traffic control devices

8 Longitudinal lines Parallel to the direction of travel Transverse lines Perpendicular to the direction of travel Arrows, words and symbol markings Special markings

9 Colors, widths and patterns are similar to the alphabet When put together, you get a word – particularly with longitudinal and transverse markings Example: - Yellow - Normal width - Double line Centerline in a no passing zone

10 Delineate vehicular paths of travel (tell cars where to go) Marking: Centerlines Lanes of travel Edgelines

11 Basic concepts of colors, patterns and widths Yellow lines Delineate the separation of opposing traffic flows Or mark the left edge of pavement of one-way roadway White lines Delineate the separation of same direction traffic flows Or mark the right edge of pavement Solid lines are restrictive Broken lines are permissive (MN 10 line – 40 gap) Dotted lines have multiple meanings (context) Double lines – maximum restrictions Width indicates degree of emphasis

12 Always yellow and normal width Patterns will give message: Broken and solid Single and double Passing vs. no passing Special uses of certain lanes

13 TWLTL Reversible Always yellow and normal width Patterns will give message: Broken and solid Single and double Passing vs. no passing Special uses of certain lanes

14 Separate lanes in same direction Always white Patterns will give message whether crossing is: Permitted (Broken) Discouraged (Solid) Prohibited (Double solid) Special dotted patterns Lane is exit only or will end Lane line extensions

15

16

17 Delineate edge of travelled way Always solid Color indicates roadway direction White always on right side Yellow on left for one-way roadway Ramp or divided highway White on left for two-way roadway Width indicates degree of emphasis Used in gores and drop lanes Wisconsin uses to indicate turn lanes

18

19 Stop line Crosswalks Yield line

20

21 Cross hatching Speed hump Parking spaces

22

23 There were total miles striped on MnDOT trunkline highways in miles of construction striping miles of maintenance striping MnDOT spent a total of $12.1 million in 2008 on pavement markings $5.7 million of construction striping $6.4 million of maintenance striping Our laserlux van took 7102 miles of retro- reflective readings in 2009

24 Retroreflective elements (beads) Retroreflective elements (beads) Liquid pavement markings Liquid pavement markings Beads added during application Beads added during application Latex Latex Epoxy Epoxy Preformed polymer tape Preformed polymer tape Beads imbedded Beads imbedded Preformed thermoplastic Preformed thermoplastic Symbols and messages Symbols and messages

25 As an agency, MnDOT primarily uses three types of products: As an agency, MnDOT primarily uses three types of products: Latex Paint Latex Paint Epoxy Epoxy Preformed Polymer Tape Preformed Polymer Tape

26 Material Approximate Expected Life Latex Paint 1+ year Epoxy 3-5 years Preformed Polymer Tape Up to 10 years

27 Pros: The cheapest option Easiest to apply Cons: Least durable Most susceptible to wear from higher traffic volumes Will likely need to be replaced every year

28 Pros: More durable than latex Cheaper than tape Cons: Lacks UV stability More complicated than latex paint to apply More expensive than latex

29 Pros: Durable (if applied correctly) Better retroreflectivity than other products Cons: More expensive than other products Product failure can cause you to lose entire marking

30 April 24, Operations Division (Construction + Maintenance) * Does Not Include Pavement Messages

31 April 24, Operations Division Total Striping Expenditures* (Construction + Maintenance) * Does not include Pavement Messages

32 Materials were experimenting with OTST safety research with pavement markings Rumble stripEs Wet-reflective markings Grooving

33 Precut Thermoplastic Pavement Messages Polyurea MMA (Methyl Methacrylate) Wet-reflective epoxy elements

34 April 24, Operations Division Enhanced Edgelines to reduce run off the road crashes Ground-in wet reflective paint 100 miles in District 4 on I-94 6 wide lines 300 miles statewide Rumble stripEs 300 miles statewide

35 Provides wet-reflectivity Provides tactile warning Distracted driver Limited visibility conditions Snow Fog Etc

36 NCHRP 641 – Rural Roads 9 percent reduction in total crashes 12 percent reduction in FI crashes 30 percent reduction in total target crashes 44 percent reduction in FI target crashes

37 NCHRP 641 – Shoulder rumble strip data Rural 2-lane roads 15 percent reduction in SVROR crashes 29 percent reduction in SVROR FI crashes Rural multi-lane divided 22 percent reduction in SVROR crashes and 51 percent reduction in SVROR FI crashes

38 Wet-reflective elements added to epoxy or latex, resulting in a wet- reflective marking Epoxy With Wet- Reflective Elements Epoxy With Standard 1.5 Index Beads

39 We know that the marking lasts longer and stays protected Is grooving in materials cost-effective? Depends…

40 April 24, Operations Division Drivers complained about lack of daytime visibility of markings on new 35W bridge Each tape skip was tagged with black epoxy as a late-season countermeasure

41 Omnibus 2008 n= 800 Statewide unless otherwise noted


Download ppt "Mn/DOT OTST Office of Traffic, Safety, and Technology."

Similar presentations


Ads by Google