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I-65 Contra-Flow Plan. 2010 Hurricane Season Alabama Department of Transportation. Hurricane Evacuation Map. Contra-Flow plan developed by ALDOT in 2000 Daytime Operation with Night-time Capability Annual Review of Plan with ALDOT, DPS and Others Annual Exercise ALDOT Call Center

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i 65 contra flow plan

I-65 Contra-Flow Plan

2010 Hurricane Season

Alabama Department of Transportation

history operation details

Contra-Flow plan developed by ALDOT in 2000

  • Daytime Operation with Night-time Capability
  • Annual Review of Plan with ALDOT, DPS and Others
  • Annual Exercise
  • ALDOT Call Center
  • Two Implementations – Ivan & Dennis
History - Operation - Details
activation levels

Level 1 – June 1st

Level 2 – NWS Hurricane Watch Gulf Coast

Level 3 – NWS Hurricane Warning Gulf Coast

Level 4 – Enact Plan

Activation Levels
slide5

LevelNumber

Actions by CO, 6th, 9th

Master Step Number

Actions at Initial Crossover

Actions at Interchanges

individual checklist
Individual Checklist

Date / Time Completed

Step # - Matches Master Checklist

Outlined Text Indicates Contact with CO / Division

traffic control plans
Traffic Control Plans

SL Radio Numbers

Personnel

Law Enforcement

List & Placement of Traffic Control Devices

detour
Detour

Contra – Flow Detour – US 31

Detour Signs During CF

interchanges

Interchanges

All Interchanges Manned

  • Department of Transportation
  • Department of Public Safety
  • National Guard (Augmentation)
type of trigger
Initially - Traffic Responsive Contra-Flow Plan
  • Then – Schedule Based
  • 2008 – Back to Traffic Responsive
    • Manpower Issues (All Agencies)
    • Scheduling Issues With Other Agencies
    • Difficult Response Times to Traffic Conditions
    • Not Cost Effective
Type of Trigger
normal n s traffic on i 65
Normal N-S Traffic on I-65

Alabama Department of Transportation

stop sb traffic
Stop SB Traffic

Alabama Department of Transportation

sb lanes empty we think
SB Lanes Empty … we think

Alabama Department of Transportation

drive south on sb lanes
Drive South on SB Lanes

Alabama Department of Transportation

drive north on sb lanes
Drive North on SB Lanes

Alabama Department of Transportation

sb lanes clear
SB Lanes Clear

Alabama Department of Transportation

contraflow on sb lanes
Contraflow on SB Lanes

Alabama Department of Transportation

evacuations should support safety of the public not driver convenience

Public wants to drive in an evacuation the same way they do during “normal” travel

  • “Normal” travel speeds are not best for evacuation
    • “Full” lanes move the largest number of cars at an average speed of 45-50 mph.
    • Slower speed reduces number of accidents
    • Accidents that do happen are less severe and traffic recovery is faster
Evacuations Should Support Safety of the Public - Not Driver Convenience
nighttime traffic volume is very low on i 65 during hurricane evacuations
Evacuation numbers depend on:
    • Mandatory and voluntary evacuations
    • Large and small storms
    • Summer or Fall
  • Contraflow is dangerous when traffic counts are too low
    • Excessive speed encouraged by light traffic
    • Empty lanes encourage driving in the wrong direction (force of habit)
Nighttime traffic volume is very low on I-65 during hurricane evacuations
hurricane ivan september 2004

7 PM

Date of Landfall: 9-16-2004

Hurricane Ivan – September 2004
hurricane dennis july 2005

7 PM

Date of Landfall: 7-10-2005

No Contraflow

(24,782 veh)

Contraflow

(28,431 veh)

Hurricane Dennis – July 2005
hurricane katrina august 2005

7 PM

Date of Landfall: 8-29-2005

Hurricane Katrina – August 2005
extended contraflow restricts pre storm emergency and relief movement

US-31 not adequate to handle southbound traffic diverted from I-65

  • Impacts evacuation efforts and pre-storm movement of relief supplies
    • Mobile plans to evacuate special needs personnel on busses using multiple round trips
  • Restoring normal traffic flow at night will help minimize negative impact
Extended Contraflow Restricts Pre-Storm Emergency and Relief Movement
extended contraflow restricts pre storm emergency and relief movement1

Hurricane Dennis

Hurricane Katrina

1 day before landfall (4845 veh)

1 day before landfall (1937 veh)

Date of Landfall: 7-10-2005

Date of Landfall: 8-29-2005

Extended Contraflow Restricts Pre-Storm Emergency and Relief Movement
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