Tiger 3 project installing ITS devices on four MS river crossings. Joint project between Arkansas, Louisiana and Mississippi. www.MSRITS.com www.mdottraffic.com

1. MISSISSIPPI
RIVER BRIDGE ITS IMPROVEMENTS
PERFORMANCE MEASURES

2. 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
Project Goals

3. Bridge Locations

4. • 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
Project Goals

5. • Advanced Transportation Management
Systems
• Advanced Traveler Information Systems
• Coordinated Incident Management
• Advanced Emergency Management
• Advanced Construction and Maintenance
Systems
Key Initiatives

6. • CCTV Cameras
• RDS Devices
• RTRC Devices
• DMS
• RWIS
• HAR
Monitoring

7. • Rural ITS Locations
• Leased Lines
• Fiber
• Cellular Networks
Communications

8. • Monitoring of ITS devices
• Sharing of information
between three States
• Sharing information between
multiple agencies
• Common ATMS system
Traffic Management

9. Mobility
• Delay
• Speed
• Throughput
• Travel Times
Safety
• Crash Totals
• Crash Rates
• Severity
Performance Measures

10. Delay based on Crash Reports
• Project Requirements
– Annual Vehicle Crash Rates
– Bridge Collision Crash Rates
– Response Times (Highways/River)
– Delay (per incident)
Performance Measures

11. • 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 Calculations

12. Measured Delay Calculation = Avg. Delay during
Accident Event + Avg. Delay During Congestion
Clearance
Delay Equation
FREE FLOW
TRAFFIC
CONGESTION
QUEUE
ACCIDENT
OCCURS
ACCIDENT
CLEARED
FREE FLOW
TRAFFIC
TIME

13. Measured Delay Calculation = Avg. Delay during
Accident Event + Avg. Delay During Congestion
Clearance
Natchez 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) *1
Delay Equation
Congestion 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
DELAY IN VEH-HR
5 1552 19400.0 14.70 94.70 Avg Delay During
Avg Delay During
Avg Queue Delay
Total Delay
Accident (min)
Accident (veh-hr)
(veh-hr)
(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

14. • Quarterly Reports
• Comparison Studies
• 5 Year Reporting Period
Reporting Period

15. • See Greater Diversion
• Less Congestion
• Lower Delay on Routes
• Fewer Accidents
• Focus on CVO
• Use RDS and CCTV to
Measure
Reporting Goals

16. MDOTTraffic.com

17. QUESTIONS ?
ACEY ROBERTS P.E.
ITS Engineer
aroberts@mdot.ms.gov