TRAFFIC AND SAFETY CONFERENCE October 18, 2017 FLASHING YELLOW ARROWS
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1 TRAFFIC AND SAFETY CONFERENCE October 18, 2017 FLASHING YELLOW ARROWS
2 FLASHING YELLOW ARROWS LEFT TURN YIELD ON FLASHIN G ARROW How did it get started Early Research Our projects Outreach Construction Our Research Observations
3 WHAT S THE PROBLEM? Safety problems with permissive left turn movements at traffic signals. High probability for an injury in a left turn crash. Circular green for left turns can be confusing. For buried lefts For a vehicle just pulling up. For beginners and the elderly For the distracted
4 HISTORY OF FYA States try various methods to improve the safety of the left turners. FR, FY, FYA, FRA. Michigan Flashing Circular Red New Jersey and California Flashing Yellow arrow Peoria, Illinois Flashing Red Arrow FHWA says we can only use one method.
5 SUMMARY OF THE RESEARCH NCHRP 493 (2003) Evaluation of Traffic Signal Displays for Protected/Permissive Left Turn Control In the laboratory On the street NCHRP 493 found that displays with exclusive heads were found to offer the higher ratings in terms of safety, operations, human factors, and versatility. The FYA was found to be more intuitive and had fewer false positive reactions as compared to the green ball.
6 MORE RESEARCH NCHRP Web-Only Document 123 (2007) Evaluation of FYA NCHRP Web-Only Document 123 follow-up study indicated significant safety benefits of the FYA. FHWA Interim approval for Optional Use of Flashing Yellow Arrow for Permissive Left Turns (March 2006) Optional in the 2009 MUTCD
7 MUTCD REQUIREMENTS Guidance: 09 For new or reconstructed signal installations, on an approach with an exclusive turn lane(s) for a left-turn (or U-turn to the left) movement and with opposing vehicular traffic, signal faces that display a CIRCULAR GREEN signal indication should not be post-mounted on the far-side median or mounted overhead above the exclusive turn lane(s) or the extension of the lane(s).
8 MUTCD REQUIREMENTS If a separate left-turn signal face is mounted overhead at the intersection, it is positioned over the extension of the left-turn lane. In a separate left-turn signal face, a flashing leftturn YELLOW ARROW signal indication or a flashing left-turn RED ARROW signal indication is used to control permissive left-turning movements.
9 WHAT DOES FYA MEAN
10 ADVANTAGES PER NCHRP 493 & 123 Provides an exclusive display for left turn control Reduces Left Turn Crashes Eliminates the left turn trap for lagging lefts. Better progression using lead - lag lefts. Increases capacity Can be used for different phasing schemes. Promotes nationwide consistency for protected/permissive display
11 DISTRICT FOUR FYA PROJECT Two Major Safety Projects April 2010 Letting IL 40 (Knoxville Ave) & US 150 (War Memorial Drive) $400, June 2010 Letting Rest of the State routes in Peoria, East Peoria, Pekin, Bartonville, Creve Coeur, North Pekin and Morton $500, Multiple small projects Galesburg, Aledo and Macomb Total of 150+ intersections
12 OUTREACH Support from the cities Presentations Brochures You Tube Attempted Press Conference Television News Stories News Paper Articles
13 WHAT DID THE CHANGE TO FYA INVOLVE? New signal heads Additional cable New controller Maybe New cabinet Maybe Rewire cabinet Reprogram Controller New MMU
14 ECONOLITE CHALLENGES EAGLE
15 CHALLENGES Software MMU Conduit Training Signs
16 SIGNS
17 PASADENA CALIFORNIA
18 BRADLEY RESEARCH Literature Review Driver Survey Gap Acceptance Red Light Running Crash Analysis
19 COMPARATIVE SURVEY RESULTS If you want to turn left, and you see the traffic signal shown below, what would you do?
20 COMPARATIVE SURVEY RESULTS If you want to turn left, and you see the traffic signal shown below, what would you do?
21 COMPARATIVE SURVEY RESULTS If you want to turn left, and you see the traffic signal shown below, what would you do?
22 B&A CRASH FREQUENCY RESULTS 92 FYA approaches with supplemental signage FINAL RESULTS Crash Type Before After % Reduction Significant?* Total crash frequency Injury crash frequency LT related crash frequency LTOT crash frequency % No % No % Yes % Yes *Based on Poisson test at 95% LOC Data Through June 2014
23 B&A CRASH FREQUENCY RESULTS 72 FYA approaches without supplemental signage FINAL RESULTS Crash Type Before After % Reduction Significant?* Total crash frequency Injury crash frequency LT related crash frequency LTOT crash frequency % No % No % No % No *Based on Poisson test at 95% LOC Data Through June 2014
24 INTERSECTION B&A - Intersection EB - Intersection Crash Type Before After % Reduction Significant?* Expected Actual % Reduction Significant?* Total crash frequency % No % No Injury crash frequency % No % Yes LT related crash frequency % Yes % Yes LTOT crash frequency % Yes % Yes APPROACH B&A - Approach EB - Approach Crash Type Before After % Reduction Significant?* Expected Actual % Reduction Significant?* Total crash frequency % No % No Injury crash frequency % No % No LT related crash frequency % Yes % Yes LTOT crash frequency % Yes % Yes *Based on Poisson test at 95% LOC Data Through June 2014
25 YOUNGER DRIVER Table 7.4 Younger Driver Analysis Results Aggregated on an Intersection-Level Aggregated on an FYA Approach-Level Crash Type Avg. Annual Before Crashes Avg. Annual After Crashes % Reduction Significant?* (p-value) Avg. Annual Before Crashes Avg. Annual After Crashes % Reduction Significant?* (p-value) Total crashes % Yes (0.05) % Yes (0.05) Injury crashes % Yes (0.02) % Yes (0.01) LT related crashes % Yes (0.01) % Yes (0.01) LTOT crashes % Yes (0.05) % Yes (0.03) * Based on Poisson Test of crash frequencies at 95% LOC and significance level α = ic.com
26 BENEFIT COST RATIO Table 8-3. Resulting Annual Benefits and Costs of FYA FYA EUAB $1,630,060 FYA EUAC $82,460 B/C Ratio ic.com
27 OBSERVATIONS - LEFT TURN TRAP Lead - Lag Lefts Progression Great results Crashes - Lake St. Left Turn crashes 3 to 14 Louvers? Patience? Left turn sight distance?
28 LEFT TURN BAY TREATMENTS
29 OBSERVATIONS Clearance intervals Yellow Clearance Red Clearance Delayed start of FYA Extended FYA TOD FYA Replace Protected Only with FYA LEFT TURN YIELD ON FLASHIN G ARROW
30 QUESTIONS Randy Laninga Operations Engineer Illinois Department of Transportation (309)
31
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