I-6 Traffic Response Program Arterial Service Patrol Mobility Strategy Evaluation Tom Ryan, HDR Carlos Sun, MU

D Clayton Hanley Kingshighway Forest Park Hampton Brentwood Ladue Ashby Tier I Tier 2 Tier 3 Tier 4 Legend 70 N Mississippi River Missouri River Meramec River Areas of Study –Tier 1 –Tier 2 –Tier 3 –Tier 4 Two-Year Full Roadway Closure Evaluation

Arterial Service Patrol Assessment Factors Reduction in traffic delay Reduction in fuel and emission Reduction in secondary crashes Reduction in response staff (emergency and operations) Improved public support

Arterial Service Patrol Public Support I-64 Traffic Response Program is DefinitelyProbably Valuable7889 I-64 Traffic Response Program overallVery SatisfiedSatisfiedVery Dissatisfied Percentage of Very Satisfied or Satisfied Effectiveness % I-64 Traffic Response Operators are Very SatisfiedSatisfiedVery Dissatisfied Knowledgeable % Courtesy % Professionalism % Safety Procedures %

Arterial Service Patrol Traffic Delay and Emission ModelTraffic DataIncident/Impact Baseline2007No Incident Post-construction 1a 2007No Incident Post-construction 2a2007Incident 5 minutes lane blockage Post-construction 1b 2007Incident 15 minutes lane blockage Post-construction 2b2008Incident 15 minutes lane blockage Post-construction 3a2007Incident 30 minutes lane blockage Post-construction 3b2008Incident 30 minutes lane blockage Response Tim -in Survey Information PercentAccumulative Percent Assists in 2008 Estimated Lane Closure < 5 minutes % to 10 minutes %64.2% to 20 minutes %86.7% to 30 minutes617.8%94.5% to 40 minutes243.1%97.6% > 40minutes192.4%100.0% 156 > 50 Total

Arterial Service Patrol Secondary Crash 2004 St. Louis Study By MU 5% Secondary Crash Factor Spatial and Temporal Thresholds 2007 Crash Data – Draft Report National Safety Council - Average Comprehensive Cost

Arterial Service Patrol Response Staff Savings HighwayAssistMulti-OrganizationsAssistDriverAssist Debris Removal1921Spill34Tire1346 I-70 Express Lane4Abandoned Vehicle2211Dispense Fluid992 Signal/Lighting209Crash2327Lost Motorist954 Signing359Mechanical2811 Pavement92 CMS/DMS132 Construction Zone77 Special Lighting1 Dead Animals315 Flooding51 Ice/Snow103 Total3264Totals4572Totals6103

Arterial Service Patrol Results Response Tim -in Survey Information Percent Incidents in 2008 Estimated Lane Closure Potential Savings < 5 minutes % $3,170,433 5 to 10 minutes % $3,167, to 20 minutes % $2,339, to 30 minutes617.8% $806, to 40 minutes243.1% $317,255 > 40minutes192.4% 156 > 50 $251,160 Total $10,052,176 St. LouisSt. Louis CountyPotential Potential SecondaryCost perEstimated Type of CrashCounty 2007% by TypeCrashesCrashes by TypeCrash TypeSavings Fatal170.2%60.3$4,100,000$1,161,667 Serious Injury1681.7% ,500$583,800 Minor Injury % ,200$1,975,493 Property Damage % ,990$1,264,235 Total $4,985,195

Arterial Service Patrol Results Total Savings Traffic Delay and Congestion Savings$1,266,574 Secondary Crash Savings$2,991,117 Response Staff Savings$57,977 Total Savings$4,315,668 Benefit/Cost5.9 Program Cost 2008 Equipment Cost$23,520 Annual Cost - Labor, gas, etc.$703,980 $727,500

Where Do We Go From Here? Current Research and Challenges

Assessment of Safety: Crash Analysis Challenges with attributing safety benefits How do we know which crashes were secondary? –MUAR 16. Traffic Conditions? –wrt Primary Incidents?

Secondary wrt Primary: Zone of Influence 2004

Distribution of Crash Severity fatalinjurypdo I I total % crash cost (1999)

Traffic Incident Management/ITS Everyone has a role: police, fire, EMS, HAZMAT, towing, MA/traffic response, TMC, media, the public What is the baseline in an evaluation? –How do we establish that baseline? Benefits in: detection, verification, traffic control, clearance? –Do benefits come from non-independent sources?

Data Issues Self-selected samples, reliability –MA survey letters vs. randomized sample Resolution compatible with detail required –ITS: real-time, dynamic, fine resolution I think the data is there, but alas!

Include Us (Evaluators) Early, Please ITS evaluations are intensely data driven Include the evaluators ahead of time – to get baseline data – to ascertain if data currently being collected is adequate – to make recommendations on what data to archive