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Matheu J. Carter, P.E. T2 Engineer Delaware T2 Center October 15, 2009 T2 Centers or LTAPs located in all 50 states Funded by FHWA and state DOTs Mission – promote training, tech transfer, research implementation at local level Delaware T2 hosted by University of Delaware, part of Delaware Center for Transportation Currently, Delaware T2 Engineer, Municipal Engineering Circuit Rider, Safety Circuit Rider Professional Engineer, licensed in six states 20+ year career, civil & env engineering Bridge, road, utility construction Design consulting Public sector (Director, DPW, Cecil County, MD) What is retroreflectivity? What is the MUTCD and to whom does it apply? What is the origin of the retroreflectivity standards? What are the standards? What do you need to do and when? What are your options for compliance? What should you be doing now? Why should you take it seriously? This is a big topic While a good start, this 2-hour webinar alone won’t prepare you So where else can you turn? The November 5 APWA CLL will be a big help also FHWA, APWA, ATSSA, NACE, and others have great web content LTAP or T2 Centers in each state and tribal region – many are conducting local training in your area It is the ability of a material to return light back towards its source It is not mirror-reflectivity, which bounces light off in the opposite direction It is definitely not diffuse reflection, which scatters the light source – think of a painted wall These signs have varying retroreflective levels – notice how brightly one returns the light versus the others Which of the stop signs below do you want at the intersections as your teenage child or grandparent comes home on a rainy night? The MUTCD is the national standard for all traffic control devices installed on all roads that are open to public travel Applies to TCDs on “any street, highway, or bicycle trail open to public travel” – 23 CFR Part 655 Subpart F Many states have their own MUTCD that meets or exceeds the federal manual General retroreflectivity standards have existed in the MUTCD for some time – Section 2A.08 1993 DOT appropriations act required standards Minimum retroreflective requirements established in Revision 2 of the 2003 Edition – Section 2A.09 Minimum requirements resulted from research targeted at the reduced reaction times and vision of some older drivers – this becomes important with some of the compliance methods Sheeting types Beaded (Engineer Grade, Super Engineer Grade, High Intensity) Prismatic (High Intensity Prismatic, Diamond Grade, etc.) Examples End Detour (black on orange) – orange ≥ 50 Do Not Enter sign (white on red) – white ≥ 35; red ≥ 7 and contrast of white to red ≥ 3:1 (wash out concern) Parking/Standing/Stopping Walking/Hitchhiking Adopt-A-Highway Blue or Brown Backgrounds Exclusive Use of Bikes or Pedestrians Note: Must still meet other requirements in MUTCD (inspections, retroreflective, etc.) 12 Develop and implement a method or methods “Compliance with the…Standard is achieved by having a method in place and using the method to maintain the minimum levels established in Table 2A-3. Provided that an assessment or management method is being used, an agency or official having jurisdiction would be in compliance…even if there are some individual signs that do not meet the minimum retroreflectivity levels at a particular point in time.” Section 2A.09 Effective date of Final Rule – January 22, 2008 1st compliance deadline– January 2012 (4 yrs) 2nd compliance deadline – January 2015 (7 yrs) 3rd compliance deadline – January 2018 (10 yrs) January 2012 Implementation & continued use of an assessment or management method designed to maintain retroreflectivity at or above established minimum retro levels (Table 2A-3) January 2015 replacement of regulatory, warning, and ground-mounted guide (except street name) signs identified as failing to meet the minimum retro levels January 2018 replacement of street name signs and overhead guide signs identified as failing to meet the established minimum levels. Visual Nighttime Inspection Calibration Signs Comparison Panels Consistent Parameters Measured Sign Retro Expected Sign Life Blanket Replacement Control Signs Future Method Based On Engineering Study Combination Of Any 15 Trained inspector Visual inspection/assessment at night Need to tie to minimum values by using Calibration signs procedure, or Comparison panels procedure, or Consistent parameter procedure 16 Common elements of all visual assessment techniques Properly aim inspection vehicle headlamps http://www.automedia.com/Aiming_Headlights/ccr20010801ha/1 http://www.coolbulbs.com/HID-VISUAL-HEADLIGHT-AIMING-PROCEDURE.pdf Two-person crew works best Having an inventory in advance is ideal Have evaluation form and criteria Conduct evaluations at roadway speed Use low-beam headlamps 17 You “calibrate” your eyes with calibration signs Calibration signs are near minimum retro You then evaluate signs as compared to calibration signs 18 Tie to minimum values with comparison panels Panels are near desired retro Clipped to sign - viewed from distance Evaluate signs compared to panels 19 Uses parameters consistent with those used to develop the minimum levels Inspector – older driver (60+) SUV type vehicle Cutoff headlamps (properly aimed) 20 Method advantages: Low administrative and fiscal burden Signs are viewed in their natural surroundings Low level of sign replacement and sign waste Method disadvantages: Subjective … but research has shown that trained observers can reasonably and repeatedly detect signs with marginal retroreflectivity. Exposure/risk of conducting nighttime inspections Paying overtime 21 Visual Nighttime Inspection Calibration Signs Comparison Panels Consistent Parameters Measured Sign Retro Expected Sign Life Blanket Replacement Control Signs Future Method Based On Engineering Study Combination Of Any 22 Use a portable instrument Receive proper training Have a protocol for consistency Compare readings to minimum values 23 Advantages: Disadvantages: Provides the most direct means of monitoring the maintained retroreflectivity levels Removes subjectivity Cost of instruments (approx $10,000 to $12,000) Measuring all signs in a jurisdiction can be time consuming Using retroreflectivity as the only indicator of whether or not a sign should be replaced may end up neglecting other attributes of the sign's overall appearance. 24 Visual Nighttime Inspection Calibration Signs Comparison Panels Consistent Parameters Measured Sign Retro Expected Sign Life Blanket Replacement Control Signs Future Method Based On Engineering Study Combination Of Any 25 Find the life of the sheeting type in your area Replacement based on expected life for individual signs 26 • Build and use a weathering rack like the one shown • AASHTO-NTPEP data • Sheeting company warranty information • Specify sign life • Measure existing signs with known install date and compare to min level • Use weathering data or nearby jurisdiction’s weathering data 27 All signs in an area/corridor are replaced at the same time at specified intervals Specified intervals could be set based on expected sign life Some existing blanket sign replacement policies exist using 10-12 years for Beaded HighIntensity sheeting signs City of Tempe, AZ Maintenance Zones 28 Sign life is estimated using a subset of signs representing an agency’s inventory. Subset of signs constitutes the “control signs” Control signs can be in-service signs or signs in a maintenance yard. Agency monitors control Example of Control Signs signs to estimate condition of all their signs. Periodically measure retroreflectivity of control signs. 29 Flexibility is provided for future advancements in technology and methods that have not been fully developed (must be based on an engineering study) Combination of methods, also 30 Visual Nighttime Inspection Calibration Signs Comparison Panels Consistent Parameters Measured Sign Retro Expected Sign Life Blanket Replacement Control Signs Future Method Based On Engineering Study Combination Of Any 31 Begin/update sign inventory Consider which maintenance/management method(s) best for your agency (at least for now) Develop an SOP, policy memo, ordinance, etc. to establish the method(s) you will use Training for you and staff/colleagues Begin preparing budget authorities Will there be a federal or state Sign Inspector coming around? Don’t believe so. Must federally funded projects comply? Yep. Can this make a big difference in traffic safety for your residents and visitors? You bet. Will this be fodder for plaintiff’s lawyers, both legitimately and illegitimately? Most likely. Because it matters Because it matters Because it matters Because it matters Because it matters Contact your local LTAP or T2 Center and/or your local FHWA division office Typical workshop training available Overview Workshop Inspector Workshop Delaware T2 Center Matt Carter, T2 Engineer [email protected]; (302) 831-7236 39