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Somerset and Union Counties
An Analysis of aTaxi Trip Distribution in Somerset and Union Counties, New Jersey
ORF 467: Transportation Systems Analysis
By Natalie Carthy and Chandler Gay
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Somerset County, New JerseyFacts:
• Population*: 324,893
• Area (sq. miles): 305
• Census Blocks*: 5,595
• Largest City: Somerville
• Major Employers: AT&T, Johnson & Johnson, Met Life
* Population and Census Block Data from US Census Bureau, 2011. Other Information from Wikipedia and Somerset County Business Partnership Source: “Somerset County,
New Jersey” – Wikipedia
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Top 10 Pixels in Somerset County
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Somerset Overview
The histogram below shows the distribution of trip lengths throughout an entire day of Somerset County departures.
93%
Trip Breakdown
IntrapixelWalkTrainaTaxi
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Pixel {129, 240} – Somerset County, North Plainfield
Item Value
Activity Locations
19
Employment
628
Population 129
School Enrollment
0
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Cumulative aTaxi Surplus Throughout the Day• This pixel exemplifies the
typical behavior seen in Somerset aTaxi surplus:• Type 1 taxis are slow to
accumulate a surplus until just after the morning commute at which point the surplus begins to rise at a steeper but constant rate
• Type 2 taxis exhibit the same behavior in the opposite direction: the shortage starts out low but becomes increasingly larger at a constant rate at the same time Type 1 changes.
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Pixel {112, 240} – Somerset County
Warren, Chubb Group
Item Value
Activity Locations
5
Employment
3,394
Population 70
School Enrollment
0Chubb Group of Insurance Companies
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Cumulative aTaxi Surplus Throughout the Day• This pixel exhibits a more
unique behavior• Type 1 aTaxis exhibit
typical behavior as seen in Somerset.
• Type 2 aTaxis, however, hold a surplus throughout the work day, which we do not see in other pixels.
• This could be explained by Chubb Group employees living in the same neighborhoods, leading to more ride share potential.
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Total Somerset County aTaxi Surplus
Deficit indicates that optimized repositioning of aTaxis returning from foreign counties will be very important in minimizing empty vehicle miles will be higher
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Total Somerset County aTaxi Surplus
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Union County, New JerseyFacts:
• Population*: 539,494
• Area (sq. miles): 105
• Census Blocks*: 7,563
• Largest City: Elizabeth
• Top Employers: Merck & Co., New England Motor Freight, USI Services Group
* Population and Census Block Data from US Census Bureau, 2011, Other Information from Wikipedia
Source: “Union County, New Jersey” – Wikipedia
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Top 10 Pixels in Union County
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Union Overview
The histogram below shows the distribution of trip lengths originating in Union.
89%
Trip BreakdownIntrapixelWalkTrainaTaxi
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Item Value
Activity Locations
210
Employment
7,176
Population 4,025
School Enrollment
2,169
Pixel {150, 244} - Union CountyElizabeth Station (NJTransit)
150 150.5 151244
244.5
245
workhomeschool
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Cumulative aTaxi Surplus Throughout the Day
• This pixel exemplifies the behavior seen in most of the other Union pixels:• Type 1 taxis have a
relatively continuous increase in their surplus throughout the day, with a jump around 8 AM due to the morning commute.
• Type 2 taxis exhibit mixed behavior: initially there is a shortage before the morning commute, at which point a quick surplus accumulates, and then a relatively steady increase in the shortage with a jump around the evening commute.
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Pixel {150, 243} - Union County
Union County College & Jail
Item Value
Activity Locations
139
Employment
19,010
Population 4,895
School Enrollment
179
150 150.5 151243
243.5
244
workhomeschool
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Cumulative aTaxi Surplus Throughout the Day
• This pixel shows irregular Union aTaxi behavior :• Type 1 aTaxi surplus is
normal.
• Type 2 taxis, however, accumulate a large surplus coinciding with the morning commute, which is partially relieved by the evening commute.
• This could be explained by Union County College students living in concentrated areas, leading to more ride share potential.
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Total Union County aTaxi Surplus
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Total Union County aTaxi Surplus
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Vehicle Assignment Algorithm
• Proceeding through the day, for each trip that appears:1) Check if an aTaxi of proper size is waiting at that pixel2) Check if there is an aTaxi of proper size with a destination
of that pixel and an ETA of less than 5 minutes Note: this could be a taxi being repositioned from a foreign
destination or a regular intracounty trip
3) Check if there is an empty taxi waiting less than 5 minutes away that is not on the clock for another departure.
4) Otherwise, “create” a new taxi Here, “create” means that a taxi would have been waiting from the
beginning of the day that has not yet been used but was placed there during the midnight repositioning
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Union Repositioning Regions
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Somerset Repositioning Regions
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Empty Vehicle Repositioning
• For the approximately 5% of the total trips that are intracounty, we assume that the aTaxi stays at its destination for simplicity.
• For the other ~95% that are intercounty trips, barring a return trip within 10 minutes, the aTaxis return to the region of highest import, where:
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Approximation of aTaxi Needs
• Theoretical minimum Determined by number of aTaxis on trips at
all times throughout the day• Theoretical maximum
Assume that foreign return trips are rare Let all aTaxis in foreign destinations return to
their domestic origin pixel (no repositioning optimization)
Max determined by the number of aTaxis on the road at all times throughout the day, including the aTaxis returning from foreign counties
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Union - Minimum aTaxis
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Union - Maximum aTaxis
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Union – Expected aTaxi Supply
Minimum aTaxis
Required
Maximum aTaxis
Required
Expected # of aTaxis
Required
Type 1 6,680 9,986 8,500
Type 2 41,445 72,523 57,000
Type 3 2,014 2,449 2,250
Type 4 256 284 275
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Somerset - Minimum aTaxis
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Somerset - Maximum aTaxis
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Somerset – Expected aTaxi Supply
Minimum aTaxis
Required
Maximum aTaxis
Required
Expected # of aTaxis
Required
Type 1 11,236 17,428 14,500
Type 2 24,821 42,152 34,000
Type 3 1,900 2,019 2,000
Type 4 127 127 127