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Recessed Pavement Markers Recessed Pavement Markers - Snowplowable Pavement Markers - Raised Pavement Markers Question # 3 Question # 4 Question # 2 Question # 5 Do you use RPMs where snow plowing If no in question 3, do you have other Question # 1 Do you have any criteria you are using to If you are using snowplowable pavement State Responder activities are being performed during winter alternative(s) for nighttime or wet condition Comments Are you using RPMs in your State? identify certain routes for RPMs markers, how it performs? can you share any time? If yes, can you please share the specs retro-reflectivity? If yes, can you please share installation? If yes, can you please share it? details you may have for it? and Standard Drawings? the specs and Standard Drawings? Yes, just standard RPMs. (See Sections 705 and 882 of Specs) Links to both Standard Drawings and Specifications immediately following We place RPMs on all 11,000 centerline miles of our Alabama Kerry C. NeSmith Yes. Not applicable I Not applicable network regardless of road class or ADT https://alletting.dot.state.al.us/Docs/Standard_Drawings/2020% 20English/70500.pdf https://www.dot.state.al.us/conweb/pdf/Specifications/2018Sta ndardSpecificationsCompleteBook.pdf Yes, only standard RPMs are used. http://ardot.gov/roadway_design_division/usunits/update_1107 19/PM-1_06-01-17%20(11-07-19).pdf Arkansas Smith, Trinity D Yes Arkansas places RPMs on 80’ spacing on all highways No No http://ardot.gov/roadway_design_division/usunits/update_1107 19/PM-2_11-07-19.pdf http://ardot.gov/standard_spec/2014/Division%20700.pdf We have a striping guideline/flow chart that shows for snow We have a section in our Authorized Material List (AML) for Yes. Please see attached standard plan sheet RSP A20D and California Duper Tong Yes, in snow plowing areas plowing area, the striping needs to be recessed, and where the N/A “Retroreflective with Abrasion Resistant Surface (ARS)” that are section 81-3.03D for the Standard Specifications. striping are recessed, the RPMs are recessed as well. for recessed application only. Colorado requires that interstate skip lines be recessed wet- Colorado Charles E. Meyer NO reflective tape and that all durable longitudinal striping (epoxy) on all highways be inlaid to avoid plow damage. This is our specification for Raised Pavement marker installation. A. Install raised pavement markers as specified below: 1. Saw cut the pavement to match the bottom contour of the marker housing using a saw and blade suitable for the pavement Material being sawed. a. The depth of the cut slot must allow the housing to be set in epoxy, with leveling lugs resting o the pavement surface, so that the front edge of marker is at or below the surface of the Raised pavement markers should be installed along interstates, pavement. The RPM’s do an excellent job of providing nighttime wet Delaware Mogle, Nick We use Raised Pavement Markers. freeways, expressways, and principal arterials. b. Repair excessive saw cuts to the satisfaction of the Engineer. reflectivity. c. Only use the truck mounted saw cutting devices. Do not use walk behind or hand cutting saw devices. 2. When cutting is complete, clean the slot as recommended by the Manufacturer of the epoxy Material. 3. Install the epoxy and pavement marker in the prepared contour slot in the pavement per the Manufacturer's recommendations. Do not leave the prepared contour slot unfilled. We avoid using recessed RPMs in Idaho for similar concerns. Yes, but again infrequently No experience with snowplowable RPMs other than to recessed Nighttime wet retros are a concern for us too and have tried Idaho Ryan D. Lancaster, Infrequently No, RPM use is case by case and has been done by state forces. No No, we do not have specs or Standard Drawings for RPMs. RPMs. inlaid tape and MMA, but our experience with them were spotty. Yes, please reference the following links: We have found them to be effective in delineating at nighttime Standard specifications on installation, section 808.11, pages and during inclement weather. They do require a significant 902 & 903: amount of maintenance- we use HSIP funds (several million a https://www.in.gov/dot/div/contracts/standards/book/sep19/8 Yes, we use RPMs on freeways ramps/gore areas and to INDOT has begun using wet reflective markings on some year statewide) to do this through contracts. To date no serious 00-2020.pdf supplement freeway lane lines and center lines on two lane projects, but the agency does not have a standard specification crashes related to the metal castings being dislodged and Indiana Boruff Dave Yes highways with AADT > 5000. We are in the process of or drawing for it at this time. Due to limits on life of the west becoming airborne but we have had a few instances of property Material specs, section 921.02(d) pages 1097 & 1098: reassessing the AADT threshold- some of our districts use them reflective elements this may not be a good, long term substitute damage. It is for this reason that several years ago we tried https://www.in.gov/dot/div/contracts/standards/book/sep19/9 on lower volume segments. for RPMs center line rumble stripes on two lane highways without the 00-2020.pdf RPMs but found that RPMs are also needed. Standard drawings: https://www.in.gov/dot/div/contracts/standards/drawings/sep1 9/e/800e/e800%20combined%20pdfs/E808-MKRM.pdf Recessed Pavement Markers - Snowplowable Pavement Markers - Raised Pavement Markers Question # 3 Question # 4 Question # 2 Question # 5 Do you use RPMs where snow plowing If no in question 3, do you have other Question # 1 Do you have any criteria you are using to If you are using snowplowable pavement State Responder activities are being performed during winter alternative(s) for nighttime or wet condition Comments Are you using RPMs in your State? identify certain routes for RPMs markers, how it performs? can you share any time? If yes, can you please share the specs retro-reflectivity? If yes, can you please share installation? If yes, can you please share it? details you may have for it? and Standard Drawings? the specs and Standard Drawings? We are moving towards a wet recoverable marking, not wet reflective. Basically the larger beads in an epoxy Iowa TIMOTHY D CROUCH No type pavement marking, recessed in a groove. We don’t have the specifications finalized yet. (steel castings) were our standard until around 2008. At that time, installation/maintenance of pavement markers was suspended due to a few instances of significant failures (multiple castings coming out on relatively new projects). The Kentucky Transportation Center conducted research to (1) See discussion in Question examine the durability of steel castings and (2) to look for #1. Snowplowable raised pavement markers are no longer alternative pavement marker options to steel castings. The Yes. Our Special Note for Inlaid Pavement markers is attached. considered a standard delineation option for Kentucky. They research concluded (1) that steel castings were durable along Kentucky has a Pavement Marker system that identifies routes Also see section 712 of our specs at: We have piloted a few projects with wet retroreflective did not necessarily perform poorly on good pavements. Kentucky Wolfe, Jeff our roadway system if pavements were adequately maintained eligible for pavement markers. The list primarily includes major https://transportation.ky.gov/Construction/StdSpecsWSupplSpe markings, but no standard alternatives at this point in time. However, lenses appeared to be more durable in and (2) found an inlaid (recessed) marker that was a suitable multi-lane highways and highways with two-way left-turn lanes cs/2019%20Standard%20Spec%20with%20Supplemental%20Spe the recessed markers, and we decided it was best not to alternative. Over the subsequent years, castings c%20July%202019.pdf continue to place steel castings along the roadway as a standard and recessed markers were considered equal alternatives. Over practice. time, the recessed markers slowly became the preferred option for most of our districts. In fact, we just put out a policy memo that eliminated steel castings as a standard option, and their use will now require approval of the State Highway Engineer’s Office. We place them on every roadway for lane lines and center lines. We also place on edge line of curves that have been Louisiana Jody Colvin yes N/A identified as a safety concern, we place on edgelines of interstates with narrow or no shoulders. We had a few instances of the cast iron “shoe” for The recessed pavement markers do not have a very long life- the snowplowable marker causing pavement failure around it cycle due to a number of factors (poor installation, freeze-thaw and eventually coming up and turning into a projectile; more cycle, puddling of water and debris in groove, etc.). than once the cast iron went through a car windshield. So about MassDOT does not install raised pavement markers. Yes (see previous answer). The latest draft of our construction Our pavement section also does not like us cutting out a quarter Massachustes Jim Danila Yes. 15 years ago we banned the use of them on all roads. We were If pavement markers are used, they are recessed in a groove. standard is attached. inch of new pavement every time we install. Therefore, we have going to experiment with Trinity Highway’s begun experimenting with short sections of recessed all- plastic snowplowable marker, but Illinois DOT studied them and weather tape as an alternative. This is also shown in the their performance was very poor. You should be able to find attached standard. their report if you search their research website.
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