transport modes and technologies a walking tour on los...
TRANSCRIPT
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Transport Modes and TechnologiesA Walking Tour on LOS, Capacity…
Urban Transportation PlanningMIT Course 1.252j/11.380j
Fall 2002
Mikel Murga, MIT Research AssociateSeptember 27, 2002
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Urban Transportation Planning – Fall 2002
Day 4
Transport Modes and Technologies
! The automobile! Transit
! Bus! Light Rail! Rapid Transit
! Non Motorized Modes! Walking! Biking
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile - Infrastructure
! Road system:! Hierarchical system:
! From turnpike to local street! From unimpeded movement to
access to properties
! Uninterrupted segments:! Turnpike (access control)
! Interrupted segments:! Traffic signals, stops…
Mobility
Land Access
Arterials
Collectors
Locals
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile + Infrastructure
! Other support systems:! Traffic Police! Traffic Management Centers! Parking! Gas stations! Garages
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile – Demand Served
! HBW: Home-based work! HBO: Home-based other:
! Shopping trips! School trips! Personal and recreational trips
! NHB: Not home-based (ie: Business trips)
HBW represents less than 35%Peak-spreading and latent demand
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Urban Transportation Planning – Fall 2002
Day 4
Highway Capacity
! The Power of Little Numbers ! Sophisticated models
are indeed needed! But so, are little
numbers in the back of an envelope
! Who wants to be taken for a ride?
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Urban Transportation Planning – Fall 2002
Day 4
Automobile Capacity = Throughput (Veh/hr/ln)
Level-Of-Service (LOS)= Flow/Capacity(or I/C or V/C)
Notice density and spacing among vehicles
Level of Service A
Level of Service F
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile – Capacity
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile – Capacity and LOS
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Urban Transportation Planning – Fall 2002
Day 4
LOS: A changing reality
! Human adaptation is the key… ! From infrastructure construction to
management of the existing system! The Highway Capacity Manual (HCM)
speed-flow curve:! People learning to drive congested roads! The initial dream of ITS
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Urban Transportation Planning – Fall 2002
Day 4
Human adaptation
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile – Capacity and LOS
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile – Capacity
! Vehicle throughput in controlled sections:! Traffic signals, roundabouts, all-stops…! Automobiles and trucks – reaction times! Saturation and gridlock
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile – Capacity Reference Nos
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile – Capacity
! PEOPLE throughput :! Vehicle throughput times OCCUPANCY! Auto-occupancy (a non-technical issue)
! HBW… 1.1! HBO-shop… 1.4! HBO-social… 1.7! NHB…… 1.6
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile – Levels-Of-Service
! The power of A to F! From spot values to travel times! Living under saturated conditions
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile – Costs
! Fixed Costs:! Vehicle purchase! Insurance
Not considered out-of-pocket expenses
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile – Costs
! Variables Costs:! Gasoline! Oil and maintenance! Parking! Tolls! Automobile Industry -> Service Economy
Ratio between Fixed and Variable Costs
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Urban Transportation Planning – Fall 2002
Day 4
The Automobile – Costs
! Social costs:! Roads! Management of road system
! Environmental costs:! Accidents (Swedish Govt.)! Noise (pedestrian areas)! Air pollution: cold-start, f(speed)! Land consumed ! Energy! Segregation! ………………
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Urban Transportation Planning – Fall 2002
Day 4
Transit vs The Automobile
Courtesy of CERTU
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Urban Transportation Planning – Fall 2002
Day 4
Transit – Demand Served
! HBW represents > 50%! Peak hours! Peak directional flows
Easy to accept overcrowding at peak to justify service during off-peak hours
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Urban Transportation Planning – Fall 2002
Day 4
Transit - Capacity
! Vehicle size! Headway (and fleet size)! Commercial speed
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Urban Transportation Planning – Fall 2002
Day 4
Transit - LOS
LOS related to Capacity and Quality of Service
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Urban Transportation Planning – Fall 2002
Day 4
Transit - LOS
! Occupancy! Hours of service! Headway! Lateness or reliability! Comfort! …. And other quality-related aspects
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Urban Transportation Planning – Fall 2002
Day 4
Transit - LOS
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Urban Transportation Planning – Fall 2002
Day 4
Transit - LOS
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Urban Transportation Planning – Fall 2002
Day 4
Transit - Cost
! Capital Costs:! >50-75 years horizon! Not included in operating costs
! Operating Costs:! Cop=Cd*veh-miles +Ct*veh-hr + Cs*fleet
! Environmental Costs:! Accident rate! Noise, soot…
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Urban Transportation Planning – Fall 2002
Day 4
Buses
! Flexibility for route adjustments! Closer stop spacing! In search of higher quality:
! Low floor buses for an aging population! Bus stops:
! Real time info on arrivals (and eventually downstream)! Maps, transfers, info on ticketing and validation
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Urban Transportation Planning – Fall 2002
Day 4
Buses
! In search of higher quality:! Real time info on board (like a good subway car)
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Urban Transportation Planning – Fall 2002
Day 4
Buses
! Capacity:! Bus type and size:
! Easy access and egress! No of doors! No of seated spaces and
no of standees! Commercial speed:
! Mixed traffic! Bus lanes! Signal priority
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Urban Transportation Planning – Fall 2002
Day 4
Buses
! Capacity (Cont’d):! Headway: Peak-hour and off-peak! Access and ticketing:
! No of doors! Access by the front door, other doors! Egress by one or two doors! Low floor! Ticket validation:
! By the bus driver! On other machines on board! On the bus stops
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Urban Transportation Planning – Fall 2002
Day 4
Rail-based systems
! Mass transit! Sense of
permanence! Separate R.O.W.
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Urban Transportation Planning – Fall 2002
Day 4
Rail-based systems
! Speed profiles
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Urban Transportation Planning – Fall 2002
Day 4
Rail-based systems
! Time-Space Diagrams
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Urban Transportation Planning – Fall 2002
Day 4
Rail vs Bus
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Viajeros anuales/31010000
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Metro 90,000 viajeros en 11 estaciones
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Viajeros 11/12/20003000
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BilboBus 90,000 viajeros en >180 paradas
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Urban Transportation Planning – Fall 2002
Day 4
Light Rail
! From Rapid Rail Transit to Light Rail:! Lower investments! But more exciting than buses! Mixed traffic segments! Easier to garner support for
priority! Attracts local development
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Urban Transportation Planning – Fall 2002
Day 4
Light Rail
! Full reserved ROW or mixed traffic
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Urban Transportation Planning – Fall 2002
Day 4
Light Rail
! Priority easily awarded…
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Urban Transportation Planning – Fall 2002
Day 4
From Public Transport to Collective Transport
! Jitney service! Taxi-Bus! Dial-a-Ride! Taxi! Car Sharing
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Urban Transportation Planning – Fall 2002
Day 4
Some comparative numbers
10,000 to 72,000
4,000 to 20,000
2,400 to 20,000
1,800 to 2,600
720 to 1,050
Capacity(pers/hr)
10-4040-9060-801500-2200600-800Veh/hr
25-7015-455-2060-12020-50Speed(km/hr)
140-2,20040-60040-3001.21.2Vehicle occupancy
Rapid Transit
Semi Rapid Transit
Bus LRT on Mixed Traffic
Car on Freeway
Car on city streets
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Urban Transportation Planning – Fall 2002
Day 4
Walking
! Capacity and LOS:! Moving (flat, stairs,
escalators) ! Waiting
! Again, only related to throughput? What about quality of the experience?
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Urban Transportation Planning – Fall 2002
Day 4
Walking
! Speed:! 2.5 mph, really?! Jaywalking prohibited in Boston?
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Urban Transportation Planning – Fall 2002
Day 4
Biking
! The power of a can of paint! Safety first and foremost
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Urban Transportation Planning – Fall 2002
Day 4
Biking
! A process:! Target population? ! Continuous O-D
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Urban Transportation Planning – Fall 2002
Day 4
Biking
A process: Ideas about how to import this into Boston??
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Urban Transportation Planning – Fall 2002
Day 4
Modal Split: A Critical Issue
! Let us see a few examples from Census Data (HBW):! Boston! Chicago! Los Angeles! Manhattan
! Any other??
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Urban Transportation Planning – Fall 2002
Day 4
Green=Walk to Work, Blue= Transit, Red=Automobile…Boston
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Urban Transportation Planning – Fall 2002
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Green=Walk to Work, Blue= Transit, Red=Automobile…Chicago
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Urban Transportation Planning – Fall 2002
Day 4
Green=Walk to Work, Blue= Transit, Red=Automobile…Los Angeles
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Urban Transportation Planning – Fall 2002
Day 4
Green=Walk to Work, Blue= Transit, Red=Automobile…Manhattan
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Urban Transportation Planning – Fall 2002
Day 4
Assignment II:The Millenium Cities Database
! This database is a world tour thanks to J.Kenworthy and F. Laube – “The Millennium Cities. Data base for Sustainable Transport” sponsored by the UITP
! A follow-up to the 1989 “Cities and Automobile Dependence” by P.Newman and J.Kenworthy
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Urban Transportation Planning – Fall 2002
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The higher the density, the higher…
… the percentage of sustainable modes
U.S.A.
Western Europe
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Urban Transportation Planning – Fall 2002
Day 4
Number of trips, nearly a constant
! The number of trips result from the activities profile
! But be aware that non-motorized trips may go unaccounted for, in some surveys
Source ISTP-UITP
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Urban Transportation Planning – Fall 2002
Day 4
Percentage of non-motorized trips
Is this a surprise?
Source ISTP-UITP
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Urban Transportation Planning – Fall 2002
Day 4
… not to be taken lightly
From Mean Streets 2000 by the Surface Transportation Project Policy (STPP)
Source ISTP-UITP
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Urban Transportation Planning – Fall 2002
Day 4
Automobile ownership
As the difference is not as big as the supply of roads…
… is congestion in Western Europe higher than in the States?
Source ISTP-UITP
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Urban Transportation Planning – Fall 2002
Day 4
The role of the automobile
Again, this should come as no surprise
Source ISTP-UITP
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Urban Transportation Planning – Fall 2002
Day 4
Trip length by car
If the number of trips are comparable…
Does the average car trip length increase inversely proportional to the metropolitan density?
Source ISTP-UITP
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Urban Transportation Planning – Fall 2002
Day 4
A congestion index
! In spite of the differences, a similar congestion ratio
! One reason the higher trip length in the States
! Is traffic like an expanding gas?
Source ISTP-UITP
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Urban Transportation Planning – Fall 2002
Day 4
Parking supply in downtown
Again the U.S. leads clearly over Western Europe
Source ISTP-UITP
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Transit coverage
Notice that the Western Europe ratio more than doubles the US ratio
Source ISTP-UITP
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Day 4
The high price of road fatalities
U.S.A.Western Europe.
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Urban Transportation Planning – Fall 2002
Day 4
CO emissions per capita
The Environmental cost
Source ISTP-UITP
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Urban Transportation Planning – Fall 2002
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Economic efficiency
! The arguments go well beyond environmental concerns, quality of life issues, moral grounds…
! Clear economic consequences
Source ISTP-UITP
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Urban Transportation Planning – Fall 2002
Day 4
The cost of a balanced system
Economic sustainability
U.S.A.Western Europe
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Assignment II: The Millenium Database
! An Open-Ended Exercise:! Data Mining! Different interpretations! Raising the right questions is more
challenging than answering them properly! Come out with your own findings! Ortega y Gasset said…