Traffic Control Devices Pooled Fund Study Update Presented by Scott Thorson, PE PTOE Traffic Engineering Section Chief Nevada DOT _______________________________ 2006 SCOTE Meeting Overland Park, KS June 26th Traffic Control Devices Pooled Fund Study Co-Chairs: Scott Thorson, Nevada DOT Scott Wainwright, FHWA Technical Liaisons: Joe Moyer, FHWA Bryan Katz, SAIC Guiding Principles Assemble a consortium of state and local entities, organizations, and FHWA to: Identify issues that are common among TCDs Select novel TCD concepts to test and evaluate Determine methods of evaluation Initiate & monitor projects intended to evaluate TCDs Disseminate results Assist in MUTCD incorporation TCD PFS Members State DOTs California DOT Florida DOT Georgia DOT Iowa DOT Illinois DOT Kansas DOT Mississippi DOT Missouri DOT Nebraska DOT FHWA New Jersey DOT Nevada DOT New York DOT North Carolina DOT Pennsylvania DOT South Carolina DOT Texas DOT Wisconsin DOT Office of Operations Office of Safety Eastern Federal Lands Local DOTs Los Angeles DOT Broward County DOT Organizations American Traffic Safety Services Association (ATSSA) Project Selection Process Project Proposals Submitted to TCD PFS Initial Downselect (National Urgency, Safety, Wide Applicability, and Acceptability) Remaining Projects Selected on: - Proposed Evaluation Technique - Cost - Likelihood of Successful Evaluation Final Selection Based on Available Funds for Sponsorship Completed Projects Pavement Markings for Speed Reduction Colors for Transponder-Controlled Tollbooth Lanes Navigation Signing for Roundabouts Pedestrian Countdown vs. Flashing Don’t Walk Pavement Markings for Speed Reduction Research Goals Determine a low-cost pavement marking treatment with a high probability of success Determine the effectiveness of the marking through a field evaluation at three different locations Texas New York Mississippi Pavement Markings for Speed Reduction Results Peripheral Transverse Lines as a Pavement Marking Pattern have the ability to significantly reduce vehicle speeds (4 mph reduction in average speeds in New York and 5 mph reduction in Mississippi) Appear to be most effective with unfamiliar drivers and in situations where roadway geometry requires a reduction in speed Colors for TransponderControlled Tollbooth Lanes Research Goals Develop a set of sign color recommendations for Transponder-Controlled Tollbooth Lanes Background Color Font Color Overlay Color with Pictographs Colors for TransponderControlled Tollbooth Lanes Results Consistent with current practice, signs with a green background and white font was easiest to see at larger distances by research participants. Navigation Signing for Roundabouts Research Goals Determine an appropriate sign type for motorists at two lane roundabouts to give information on lane choice and exit leg choice Investigate Conventional, Diagrammatic, New York, and Maryland type roundabout signing in conjunction with pavement markings Navigation Signing for Roundabouts Results Conventional and Diagrammatic Signs were more easily understood than the New York and Maryland style signs Further investigations into turn restriction markings is recommended Pedestrian Countdown vs. Flashing Don’t Walk Research Goals Will removal of the flashing hand: Improve pedestrian comprehension of the pedestrian change interval? Allow pedestrians to cross more safely and successfully? Pedestrian Countdown vs. Flashing Don’t Walk Results Experimental signal may lead to fewer confusions than the standard countdown signal Results of the study do not provide dramatic evidence in favor of, or against, the use of the experimental countdown rather than the standard countdown signal Current Projects Evaluation of Selected Symbol Signs Stutter Flash for Flashing Beacons at Unsignalized Pedestrian Crossings Evaluation of Selected Symbol Signs Research Goals Evaluate a series of symbols to determine the best symbol for various information based on driver comprehension and legibility Research Tasks: Review of Symbols Used Determine Alternatives Comprehension Test Conspicuity and Legibility Test Final Report Stutter Flash for Flashing Beacons at Unsignalized Pedestrian Crossings Research Goals Can the effectiveness of the overhead flashing beacon be enhanced by replacing the traditional slow flashing incandescent lamps with rapid flashing LED lamps? 2006 Selected Projects Truck Electrification Symbols Potential Benefits of Enlarged Pedestrian Signals Diagrammatic Freeway Guide Sign Design Lane Restriction Marking and Signing for Roundabouts Warning Sign Legends for Emergency Incidents Truck Electrification Symbols Research Goals Determine a symbol sign to let truck drivers know where truck electrification facilities are located. Potential Benefits of Enlarged Pedestrian Signals Research Goals Determine visibility requirements of enlarging pedestrian signals at locations with long crosswalks. Diagrammatic Freeway Guide Sign Design Research Goals Evaluate alternatives for diagrammatic freeway guide signs to determine which sign alternatives perform best with varying scenarios (number of through lanes, number of exiting lanes, option lanes, horizontal curvature) Lane Restriction Marking and Signing for Roundabouts Research Goals Evaluate traditional versus fishhook-style signs and markings to determine their effectiveness. Warning Sign Legends for Emergency Incidents Research Goals Determine warning sign legends that are required for first responders where only a minimum number of signs can be used. Questions? For further information, contact: Bryan Katz Joe Moyer (202) 493-3388 (202) 493-3370 [email protected] [email protected]
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