Guide for Pavement Friction (2009)

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B-1 APPENDIX B STATE FRICTION SURVEY FORM

B-2 PAVEMENT SURFACE FRICTION 1. Provide the following information concerning your agency’s friction test methodology: a. What test standard does your agency use for friction testing? ASTM E274 ________________________ ISO XXYY ________________________ Other ________________________ b. If the answer to (a) is Other, please explain. __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ c. What type of equipment does you agency use for friction testing? Yes No ASTM E 274 skid trailer F F Norsemeter variable slip friction tester F F Mu-meter trailer F F BV-11 skidometer trailer F F GripTester trailer F F Surface friction tester F F Penn State skid trailer F F Other_____________________________________________________ d. For agencies using an ASTM E 274 skid trailer, please specify test tire type: Yes No Smooth F F Ribbed F F Other F F e. What is the frequency of calibration of test equipment? Prior to each test F Monthly F Yearly F Other (specify) ___________________________________________________

B-3 f. Does your agency use the International Friction Index (IFI) as the index for characterizing pavement surface friction? F Yes F No 2. What aggregate properties are specified in your design for friction surfaces? ________________________ ________________________ ________________________ 3. What aggregate tests are used to ensure the properties are met? ________________________ ________________________ ________________________ None ___________________ 4. What is your agency’s practice concerning: a. Surface conditions that trigger restoration/rehabilitation to restore surface friction of in-service pavements? ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ b. The relationship between pavement surface friction and crash rates? ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 5. Does your agency have guidelines for the items below to ensure meeting your friction requirements: Use of specific aggregate types (all pavements)? F Yes F No Surface texture requirements (all pavements)? F Yes F No Aggregate size, gradation, and shape (all pavements)? F Yes F No Aggregate polish value (all pavements)? F Yes F No Mix type (for AC pavements)? F Yes F No Use of additives and rubber in AC surface mixtures (for AC pavements)? F Yes F No Surface finishing (for PCC pavements)? F Yes F No

B-4 6. What is your agency’s method(s) for PCC finishing/surface texturing? Tining F Grooving F Burlap F Grinding F Other F Please specify Include information on the dimensions, direction (transverse, longitudinal, skewed), uniformity, and so on, of the surface finishing: ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ 7. What techniques are used by your agency to maintain in-service pavement surface friction? Grinding F Thin overlays F Micro-surfacing F Others F PAVEMENT–TIRE NOISE 8a. Do you consider pavement–tire noise in the selection of pavement surface material or pavement surface texture? For asphalt concrete pavements: F For urban freeways only F For urban highways F No For portland cement concrete pavements: F For urban freeways only F For urban highways F No

B-5 8b. Do you specify pavement surface materials or pavement surface texture for pavement– tire noise concerns? For asphalt concrete pavements: F For urban freeways only F For urban highways F No For portland cement concrete pavements: F For urban freeways only F For urban highways F No 9. What types of pavement surface material or pavement texture do you specify for pavement–tire noise concerns? For AC pavements For PCC pavements F Open-graded (popcorn) mix F Random tining F Stone mastic asphalt (SMA) F Burlap drag F Rubberized asphalt _________ F Grooving F Other _____________________ F Grinding F Other ____________________ 10. Do you have any documentation on the selection of pavement surface materials or textures to minimize pavement–tire noise? F Yes F No 11. What types of pavement–tire noise measurements have you carried out? Yes No Pass-by measurements of the total traffic flow F F Pass-by measurements of individual vehicles F F Measurements inside a moving vehicle F F Near tire measurements in the field F F Near tire measurements in the laboratory F F None F F Other (please describe) ___________________________________________ _________________________________________________________________ _________________________________________________________________

B-6 PAVEMENT SURFACE TEXTURE 12. Is pavement surface texture specified in the selection of pavement surface materials or pavement surface texture? For asphalt concrete pavements: F For urban freeways only F For urban highways F No For portland cement concrete pavements: F For urban freeways only F For urban highways F No 13. What kind of pavement surface testing is carried out by your agency? Yes No Grease sample F F Sand patch F F Outflowmeter F F British pendulum tester F F None F F 14. How often is pavement surface texture testing carried out? Never F Yearly F Every other year F Every 5 years F Only for research purposes F 15. Do you have any documentation on how your agency relates pavement surface texture to pavement surface friction and pavement–tire noise? F Yes F No 16. Do you have any reports papers or data describing the results of pavement surface texture measurements sponsored by your agency that you can share with us? F Yes F No

B-7 17. What are your agency’s surface texture enhancement policies? a. Are there minimum surface texture characteristics for which remedial action is required? F Yes F No b. If yes, what are the requirements? ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ c. What remedial actions are used to restore surface texture? Grinding F Thin overlays F Micro-surfacing F Others F SAFETY AND LEGAL ISSUES 18. Do you have documentation on how your agency relates wet pavement surface characteristics (friction and surface texture) to crash rates? F Yes F No REQUEST FOR INFORMATION 19. Do you have any reports, papers, specifications, or other documents describing your agency’s requirements for pavement surface friction, surfacing materials and texture specifications and test methods, friction measuring techniques, results of tire noise measurements sponsored by your agency, and any information on friction/crash-related issues and associated legal concerns that you can share with us? If information is available, please indicate how we might obtain the documents. ___________________________________________________________ ___________________________________________________________ __________________________________________________________