Work Zone Safety & Mobility

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Presentation transcript:

Work Zone Safety & Mobility Excerpts from a Presentation Given at the Montana Regional Work Zone Rule Workshop in April 2006 Dave Holstein, Administrator ODOT Office of Traffic Engineering dave.holstein@dot.state.oh.us 614-644-8137

Linking Safety and Congestion In Ohio 43% of all Interstate crashes happen on 12% of the Interstate system. 19% of all NON Interstate crashes happen on 2% of the NON Interstate system. When overlaid against Ohio’s congested locations the 12% (IR) and 2% (NON IR) are an almost exact match to the congested locations. Congestion causes crashes

Linking Safety and Congestion Historical WZ crash analysis in Ohio shows that congested work zones CAUSE CRASHES. Much of ODOT’s WZ processes revolve around identifying work zone capacity needs and determining constraints to providing that necessary capacity.

Why Maintenance of Traffic (MOT) is Important in Ohio 35th in geographical size 10th largest highway network 5th highest volume of traffic 5th highest volume of truck traffic 4th largest interstate network 2002 NCAA Football Champions

Why MOT is Important in Ohio Need to comply with the new Federal Regulations on Work Zone Safety and Mobility (23 CFR 630 –Subpart J) October 2007 Deadline

Why MOT is Important in Ohio Because We Can Make a Difference

Why MOT is Important in Ohio In addition to mobility, safety, and economic reasons for good work zone processes…………… Our Governor got REALLY mad when he was stopped in a work zone!!

ODOT’s WZ Process in Terms of the New Federal WZ Regulations Historical WZ Crash Data 630.1008 State Level Processes and Procedures “Shall use field observations, wz crash data….” “Shall continually pursue improvement of wz safety and mobility by analyzing work zone crash and operational data from multiple projects….”

Why did we do the analysis? ODOT’s WZ Process in Terms of the New Federal WZ Regulations Historical Crash Analysis Why did we do the analysis? ODOT is embarking on the largest construction program(s) in our history Director was concerned about the impact our work zones will have on crashes Question - Are the ODOT work zones causing more accidents? - If so, can we do more to limit the increase?

ODOT’s WZ Process in Terms of the New Federal WZ Regulations Historical Crash Analysis THE KNEE JERK REACTION “Well of course we have more crashes in work zones. Narrow lanes, barriers next to lanes, and on… and on…. and on….” Historical crash data analysis showed there were things we could do better!!

ODOT’s WZ Process in Terms of the New Federal WZ Regulations Historical Crash Analysis WZ Crash Rate=1.68 NON WZ Crash Rate Rate= 1.04

ODOT’s WZ Process in Terms of the New Federal WZ Regulations Historical Crash Analysis WZ Crash Rate=2.02 NON WZ Crash Rate Rate =1.19

Drilled deeper into data ODOT’s WZ Process in Terms of the New Federal WZ Regulations Historical Crash Analysis Drilled deeper into data Logged and analyzed hundreds of work zone crashes. Looked for “abnormally” high concentration of crashes. Analysis showed need for new/revised specifications & processes

ODOT’s WZ Process in Terms of the New Federal WZ Regulations Historical Crash Analysis Results – Geometrics - The “abnormally” high concentrations of crashes showed there were major geometric contributing factors to Ohio’s work zone crashes: (a) Inadequate ramp merges (b) Inadequate off-ramp capacity (c) Insufficient paved shoulders

Off-Ramp-Capacity – Now explicitly looked for in MOTAA. ODOT’s WZ Process in Terms of the New Federal WZ Regulations Historical Crash Analysis Ramp Merges – Created new standards for work zone on-ramp merges. Merges are now required to be detailed in plans. (now explicitly looked at in MOTAA) Paved shoulders – Created “desired/minimum” cross section that requires a 2’ paved shoulder (now used in Maintenance of Traffic Alternative Analysis (MOTAA) and detailed design) Off-Ramp-Capacity – Now explicitly looked for in MOTAA.

ODOT’s WZ Process in Terms of the New Federal WZ Regulations Historical Crash Analysis Historical wz crash analysis will be performed every two years seeking additional “lessons learned”. Policies/standards/specifications will be changed as necessary to keep problems from happening again.

Hot off the presses – 2006 Historical Data Analysis has started….. ODOT’s WZ Process in Terms of the New Federal WZ Regulations Historical Crash Analysis Hot off the presses – 2006 Historical Data Analysis has started….. Emphasis on Fatalities and Fatal Crashes….. Preliminary Information follows…..

ODOT’s WZ Process in Terms of the New Federal WZ Regulations 2006 Historical Crash Analysis New Emphasis Areas??

ODOT’s WZ Process in Terms of the New Federal WZ Regulations 2006 Historical Crash Analysis Of the total 110 fatal WZ crashes; 22 involved pedestrians as the victim (20%).

18 of the 22 pedestrians were construction workers (82%). ODOT’s WZ Process in Terms of the New Federal WZ Regulations 2006 Historical Crash Analysis 18 of the 22 pedestrians were construction workers (82%). 5 of the 18 were construction related vehicle running over the worker. 4 of the 18 were workers being inside the travel lane. 8 of the 18 were vehicles speeding, running off the road or driving through a coned off lane and striking a worker. 1 of 18 included a vehicle hitting a bucket truck and the worker fell out

ODOT’s WZ Process in Terms of the New Federal WZ Regulations 2006 Historical Crash Analysis 17 of the fatal crashes were caused by vehicles not stopping when traffic was stopped in the traveling lanes (15%). 11 of the 17 were on Interstate routes. 3 of the 17 during morning peak hours 3 of the 17 occurred during the evening peak hours 6 of the 17 occurred at night (9:30 pm to midnight) 2 of the 17 occurred midday 3 of the 17 occurred due to vehicles not stopping for equipment in the travel lane. We’re not supposed to have backups?!?!?! ??? What the heck were we doing at this time of night???

ODOT’s WZ Process in Terms of the New Federal WZ Regulations 2006 Historical Crash Analysis Problems?

ODOT’s WZ Process in Terms of the New Federal WZ Regulations Real Time WZ Crash Data 630.1008 State Level Processes and Procedures “Shall use field observations, wz crash data….” “Shall continually pursue improvement of wz safety and mobility by analyzing work zone crash and operational data from multiple projects….”

Candidate projects identified in winter. ODOT’s WZ Process in Terms of the New Federal WZ Regulations Real Time Crash Analysis Candidate projects identified in winter. Coordinate w/local enforcement to have WZ crashes put aside for pickup twice/month. PHYSICALLY PICKING UP CRASH REPORTS IS THE ONLY METHOD THAT HAS WORKED. Data base application automatically sorts crashes into ½ mile segments (geo – locate). Compared to historical “non-construction” frequencies. “Problem” locations investigated.

-This slide targeted to the computer enthusiasts ODOT’s WZ Process in Terms of the New Federal WZ Regulations Real Time Crash Analysis -This slide targeted to the computer enthusiasts Data input into Access data base through data entry form. Crash trends are sorted and analyzed using pivot tables/charts. Individual queries created for each wz in Access data base file. Excel (using visual basic coding) hits data base file and runs queries to refresh charts and graphs with latest data. WARNING

System is set up by start of construction season. ODOT’s WZ Process in Terms of the New Federal WZ Regulations Real Time Crash Analysis System is set up by start of construction season. Once Set-up, the ONLY thing needed done is to input new crash data. ALL CHARTS, GRAPHS, & DATA ARE GENERATED AUTOMATICALLY WITH THE PUSH OF A BUTTON – VERY COOL ……….

ODOT’s WZ Process in Terms of the New Federal WZ Regulations Real Time Crash Analysis Main Screen

Click to Access Data Entry Screen ODOT’s WZ Process in Terms of the New Federal WZ Regulations Real Time Crash Analysis Click to Access Data Entry Screen

Crash Report Data Entry Form ODOT’s WZ Process in Terms of the New Federal WZ Regulations Real Time Crash Analysis Crash Report Data Entry Form

Non WZ Avg # of Crashes = 31 (7 months) ODOT’s WZ Process in Terms of the New Federal WZ Regulations Real Time Crash Analysis Non WZ Avg # of Crashes = 31 (7 months) Application Outputs WZ 3 Month Crash Total =48 (Big Problem) Mile 16.2 – 16.99

ODOT’s WZ Process in Terms of the New Federal WZ Regulations Real Time Crash Analysis Application Outputs

ODOT’s WZ Process in Terms of the New Federal WZ Regulations Real Time Crash Analysis Application Outputs

ODOT’s WZ Process in Terms of the New Federal WZ Regulations Real Time Crash Analysis Application Outputs