Transportation leadership you can trust. Lamar Avenue Corridor Study Using Field Data for Short Corridor Planning presented to presented to 2010 ITTS Conference 2010 ITTS Conference presented by presented by Dike Ahanotu Dike Ahanotu Cambridge Systematics, Inc. Cambridge Systematics, Inc. with with Marty Lipinski Marty Lipinski University of Memphis University of Memphis January 27, 2010 January 27, 2010
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Transportation leadership you can trust.
Lamar Avenue Corridor StudyUsing Field Data for Short Corridor Planning
presented topresented to
2010 ITTS Conference2010 ITTS Conference
presented bypresented by
Dike AhanotuDike AhanotuCambridge Systematics, Inc.Cambridge Systematics, Inc.
withwith
Marty LipinskiMarty LipinskiUniversity of MemphisUniversity of Memphis
January 27, 2010January 27, 2010
1
Early Thoughts on Short Corridor Planning
Step away from the model and go see the corridor
Field data should be used to
• Paint picture of the corridor
• Improve the model
• Identify solutions
• Evaluate alternatives
2
Background on Lamar Avenue Corridor
7.7 mile corridor connecting I-22 to I-240 in SE Memphis
3
Background on Lamar Avenue Corridor
Freight-intensive corridor with recently expanded BNSF yard
4
Data Assembled and Collected by U. of Memphis
Traffic Counts
Level of Service
Travel Time
Truck-Following Data
5
Classification Count Data
Classification counts at two locations on Lamar Avenue
0
500
1,000
1,500
2,000
2,500
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:0
014:0
015:0
016:0
017:0
018:0
019:0
020:0
021:0
022:0
023:0
0
Auto Truck
Num ber of Vehicles
6
Classification Count Data
Lots of total volume counts
7
Turning Counts
Identify most heavily used intersections
N
East Holmes Road
East Shelby Drive
Winchester Road
Knight Arnold RoadDemocrat Road
American Way
Getwell Road
South Perkins Road
East Raines Road
Tuggle Road
1,123
798
2,310
0
58 1,681
175
271 387
151
2,539
Lamar
Avenue
240
78
to downtown Memphis
to Mississippi
East Holmes Road
East Shelby Drive
Winchester Road
Knight Arnold RoadDemocrat Road
American Way
Getwell Road
South Perkins Road
East Raines Road
Tuggle Road
231
783
327
832
763 174
937
781 502
140
0
Lamar
Avenue
240
to downtown Memphis
78
to Mississippi
8
Intersection Level of Service
IntersectionA.M. Peak Hour
7:30-8:30
Lunch PeakHour
11:30-12:30Midday Peak
Hour 2:30-3:30P.M. Peak Hour
4:30-5:30 Average
Lamar at AmericanWay
C C D F D
Lamar at Pearson B D B B C
Lamar at Democrat C E B B C
Lamar at KnightArnold
B C B C C
Lamar at Winchester F F F F F
Lamar at Concorde E B A B C
Lamar at Shelby F F F F F
Lamar at Tuggle E F A B D
Lamar at Holmes F E E F F
Average D D C D D
Source: University of Memphis Analysis, June 2009.
9
Segment Travel Time – Southbound P.M. Peak
Roadway Segment Average TravelTime (minutes)
AverageSpeed (mph)
Prescott Road to American Way 1.1 34.3
American Way to Democrat Road 1.4 28.0
Democrat Road to Knight Arnold Road 0.7 31.5
Knight Arnold Road to Getwell Road 1.1 37.5
Getwell Road to Winchester Road 1.8 17.7
Winchester Road to Raines Road 1.4 47.1
Raines Road to Shelby Drive 6.8 14.8
Shelby Drive to Holmes Road 3.0 23.5
Holmes Road to Mississippi State Line 1.8 34.9
Total Route 19.0 23.8
Congestion is concentrated at a few intersections
10
Truck-Following Data – BNSF Yard
11
Truck-Following Data – State Line
12
Truck-Following Data – I-240
13
What is the picture of the corridor?
Lamar Avenue is a freight-intensive corridor, but autosare still important
• Commute traffic is especially important
Congestion is concentrated at the southern end of thecorridor
• Also concentrated at specific segments
Even balance of local and through truck traffic in thecorridor
• On Lamar Avenue
• At BNSF yard
14
How the Model Is Being Improved
Identified that model routed too many trucks to ShelbyDrive
• Not enough trucks on Lamar Avenue
• Will distort alternatives analysis, unless adjusted
Impedance being added to Shelby Drive to push trucksback to Lamar Avenue
15
Implications for Identifying Solutions
Corridor solutions must balance several items
• Trucks and autos
• Through truck trips and local trucks trips
16
Implications for Evaluating Alternatives
Speed data from travel time runs likely more accuratethan speeds in model
Turning count, LOS data used to focus intersectionimprovements
Routing information used to interpret impact ofalternatives on specific truck trip travel patterns
17
Lessons Learned for Short Corridor Planning
Understand the strengths and weaknesses of the specifictravel demand model
Use field data to provide additional perspective on thecorridor
• Also use field data to improve model
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