Statistical Analysis of New Orleans 1999-2006 Crash Data

8/6/2019 Statistical Analysis of New Orleans 1999-2006 Crash Data

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Statistical Analysis of New Orleans

1999-2006 Crash Data

UNIVERSITY OF NEW ORLEANS

State Project No. 737-99-0762

July 2009 New Orleans, Louisiana

A Project of the

Regional Planning Commission and the

Louisiana Department of Transportation and

Development


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StateProjectNo.737990762

Funding for thisevaluationwasprovidedby theLouisianaDepartmentof

Transportation and Development Highway Safety Department through a

grant to the Regional Planning Commission for Jefferson, Orleans,

Plaquemines,St.BernardandSt.TammanyParishes for theGreaterNew

OrleansPedestrianandBicycleProgram.Theevaluationwasaccomplished

bytheUniversityofNewOrleansPedestrianandBicycleResourceInitiative

undertheauspicesoftheNewOrleansRegionalPlanningCommission.


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1.INTRODUCTIONVehicular and pedestrian crash data are collected by the police agencies of parishes andmunicipalities in the New Orleans metropolitan region, and are available from the years

1999 to 2006. These data are provided in Microsoft Excel spreadsheet (.xls) and

Microsoft Access database (.mdb) formats.

DISCREPANCIES

The data collected from the years of 1999 to 2002 are available in spreadsheet format and

lack many of the characteristics that the Access data collected from the years of 2003 to2006 contain. For instance, many of the data fields available in the latter set give

specific demographic information about the drivers available in each collision, such as

age, race, and gender. This is missing from the 1999-2002 set, and thus the 2003-2006data will be treated in more detail.

METHODOFANALYSIS

ESRIs ArcGIS software was used to analyze the frequency of certain characteristicscontained within the 2003-2006 crash data. Instructions on how to prepare and analyze

these data are available in PBRIs Guidebook to Comprehending and Organizing

Pedestrian Bicycle Crash Data in the New Orleans Metropolitan Region.

2.ANALYSISOFCYCLISTCOLLISIONSAs mentioned in the introduction, the 1999-2002 dataset is missing demographic data,and therefore only the 2003-2006 dataset will be analyzed in this section. Between these

years, there were a total of 1340 collisions involving bicycles.

There is an evident spike in collision events involving bicyclists between the ages of 9

and 17, with 12 to 14 year old cyclists being the most frequently involved in collisions of

all age groups. Another lesser spike occurs in the 42 to 48 year old range. The mean ageof 28 is in fact contained in the most underrepresentedage group of individuals involved

in bicycle collisions. The mean is both positively and negatively affected. The high-

frequency groups are adolescents and late-middle-aged adults; cyclists in their latetwenties and early thirties are less frequently involved in collisions.

Ageofallcyclistsinvolvedincollisions.

Thetabletotheleftdisplaystheageof

bicyclistsinvolvedinacollisionalongthe

xaxisandtheoccurrenceofcollisions

alongtheyaxis.Themeanageofa

bicyclistinvolvedinacollisionis28years

old.


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STATISTICALANALYSISOFNEWORLEANS19992006CRASHDATA

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RACEOFCYCLISTSINVOLVEDINCOLLISIONSBYPARISH

REGIONWIDE;TOTAL:1215

RACE CRASHES % TOTAL

Black 635 52%

White 532 43%Other 47 3%

ORLEANS;TOTAL:624

Black 414 66%

White 192 31%

Other 18 2%

JEFFERSON;TOTAL:428

Black 181 42%

White 226 53%

Other 21 5%

ST.TAMMANY;TOTAL:100

Black 26 26%

White 70 70%

Other 4 4%

ST.BERNARD;TOTAL:52

Black 13 25%

White 37 71%

Other 2 3%

PLAQUEMINES;TOTAL:11

Black 1 9%

White 7 63%

Other 2 18%

AGE,RACE,ANDGENDER

Age of black cyclists involved in collisions.

Thecharttotheleftdisplaysagealongthex

axisandfrequencyalongtheyaxis.The

characteristicsofbicyclecollisionsinvolving

blackcyclistsgreatlyresemblethatofthe

overalltrends,withameanageof27years

old.Agreaterfrequencyofcollisionsoccurs

inslightlyyoungeragegroupsthanthe

overallaverage,however.

These tables take into account only bicycle

crash incidents with race reported, which

accounts for 1215 of the 1340 bicyclecollision incidents reported between the

years of 2003 and 2006. The percentage

results are rounded to the nearest number.


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The19992002datasetprovidescrashdatafortheparishesofSt.CharlesandSt.John

whereasthe20032006datasetdoesnot,sothenumberofcrashincidentsforthose

parishesonlyreflecttheyearsof1999to2002.

CRASHINCIDENTSBYPARISH;TOTAL*:1753

PARISH #OFCRASHES %OFTOTAL

Orleans 938 54%

Jefferson 598 34%

St.Bernard 79 4%

St.Tammany 126 7%

Plaquemines 12 .6%

St.Charles 9 N/A

St.John 5 N/A

*ThetotaldoesnotincludetheParishesofSt.CharlesandSt.John.

Age of white cyclists involved in

collisions. The mean age of white cyclistsinvolved in collisions is 32, and the 9 to 11

years-old age group is proportionately less

likely to be involved in collisions than

black cyclists of the same age. There is,

however, a greater likelihood of whitecyclists in their late 20s to be involved in

collisions than black cyclists of the sameage.

Age of males involved in bicycle collisions.Given that crashes involving male cyclists

represent the overwhelming majority of

incidents, the

Age of females involved in bicycle

collisions. One noticeable difference

between the male and female statistics is

the higher proportion of females betweenthe ages of 21 and 27 involved in

collisions.


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3.ANALYSISOFPEDESTRIANCOLLISIONSLikethebicycledata,thepedestriandatapresentedherewascollectedfromtheyears

of2003to2006.

DAY CRASHES %CRASHES

MONDAY 399 14%TUESDAY 363 13%

WEDNESDAY 422 15%THURSDAY 404 14%

FRIDAY 495 17%SATURDAY 380 13%

SUNDAY 378 13%

SEX CRASHES %CRASHES

MALE 1641 58%

FEMALE 1050 37%

PEDESTRIANCRASHESBYPARISH;2841TOTAL

PARISH CRASHES %CRASHES

ORLEANS 1873 66%

JEFFERSON 719 38%

PLAQUEMINES 13 .4%

ST.BERNARD 70 2%

ST.TAMMANY 166 6%

Age of pedestrians involved in collisions.

There is an overall trend for collisions to occurless frequently among older age groups

following the 3 to 6 year old age range, with a

noticeable increase of occurrences involving

37 to 49 year old pedestrians that somewhat

offsets this trend.

Pedestrian crash incidents by day.The chart to the right shows 2841collision incidents involving

pedestrians broken down by day.

Pedestrian crash incidents by sex.

Collision incidents involving pedestrians,

Broken down by sex.

Statistical Analysis of New Orleans 1999-2006 Crash Data

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