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MISSISSIPPI
RIVER BRIDGE ITS IMPROVEMENTS
PERFORMANCE MEASURES
Project Goals
Mississippi River Bridge Incident Management, Freight Movements and Security Project
Tiger 3 Project – Arkansas, Louisiana, Mississippi
• Improves mobility and safety
• Assists multi-model traffic (Highway and River)
• Uses ITS to accomplish these goal
• MSRITS.com
Bridge Locations
Project Goals
• Improve Traveler Information Services
• Improve Incident and Emergency Management
• Manage and Mitigate Congestion
• Improve Efficiency and Safety of Goods
• Provide for Locally Specific Goals/Needs
• Improve Interagency/Inter-Jurisdictional Coordination, Cooperation and Information Sharing
Key Initiatives
• Advanced Transportation Management Systems
• Advanced Traveler Information Systems
• Coordinated Incident Management
• Advanced Emergency Management
• Advanced Construction and Maintenance Systems
Monitoring
• CCTV Cameras
• RDS Devices
• RTRC Devices
• DMS
• RWIS
• HAR
Communications
• Rural ITS Locations
• Leased Lines
• Fiber
• Cellular Networks
Traffic Management
• Monitoring of ITS devices
• Sharing of information
between three States
• Sharing information between
multiple agencies
• Common ATMS system
Performance Measures
Mobility
• Delay
• Speed
• Throughput
• Travel Times
Safety
• Crash Totals
• Crash Rates
• Severity
Performance Measures
Delay based on Crash Reports
• Project Requirements
– Annual Vehicle Crash Rates
– Bridge Collision Crash Rates
– Response Times (Highways/River)
– Delay (per incident)
Delay Calculations
• Delay based on Crash Reports
• MDOT SAMS
Crashes near/on Bridge
• Coast Guard Reports
• Assumptions
Peak Hour Flow (AADT)
Full Lane Closures
Minimum Diversions
Delay Equation
Measured Delay Calculation = Avg. Delay during
Accident Event + Avg. Delay During Congestion
Clearance
FREE FLOW
TRAFFIC
CONGESTION QUEUE
AC
CID
ENT
OC
CU
RS
AC
CID
ENT
CLE
AR
ED
FREE
FLO
W
TRA
FFIC
TIME
Delay Equation
Measured Delay Calculation = Avg. Delay during
Accident Event + Avg. Delay During Congestion
ClearanceNatchez Bridge
MDOT CRASH DATA
Crash # Date Description Severity Index Clearance Time (min)
1 05/17/2013 Run off Road - Right 5 64
2 06/04/2013 Head on 4 40
3 06/22/2013 Run off Road - Left 5 50
4 07/09/2013 Rear end slow or stop 4 69
5 07/20/2013 Rear end slow or stop 5 80
Total Vehicle Delay (Based on MDOT SAMS data)
Crash # Congestion (veh) *1Congestion Length (ft) (2 lanes) *2
Free Flow time (min) *3
Total Clearance Time (min)
1 1242 15520.0 11.76 75.76
2 776 9700.0 7.35 47.35
3 970 12125.0 9.19 59.19
4 1339 16732.5 12.68 81.68
5 1552 19400.0 14.70 94.70DELAY IN VEH-HRAvg Delay During Accident (min)
Avg Delay During Accident (veh-hr)
Avg Queue Delay (veh-hr)
Total Delay (veh-hr)
32.00 662.19 121.75 783.94
20.00 258.67 47.58 306.25
25.00 404.17 74.33 478.49
34.50 769.70 141.51 911.20
40.00 1034.67 190.20 1224.87
Reporting Period
• Quarterly Reports
• Comparison Studies
• 5 Year Reporting Period
Reporting Goals
• See Greater Diversion
• Less Congestion
• Lower Delay on Routes
• Fewer Accidents
• Focus on CVO
• Use RDS and CCTV to
Measure
MDOTTraffic.com
