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Text File | 1990-10-17 | 3.3 KB | 161 lines | [04] ASCII Text (0x0000) |
- // AIR QUALITY MODEL
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- COLUMNS 1999 .. 2005
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- bridge capacity = .75,1
- tunnel capacity = .20,.40,.60,.80,1
- // assuming bridge actually will be repaired in 2000, tunnel in 2003
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- average bridge delay at full capacity = .5
- // assuming 1/2 hour average delay at full capacity
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- average tunnel delay at full capacity = .75
- // assuming 3/4 hour
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- // model average delay at crossings as average of bridge and tunnel delays
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- average delay on entering city = '
- ( average bridge delay at full capacity * (2 - bridge capacity) '
- + average tunnel delay at full capacity * (2 - tunnel capacity) ) / 2
- //
- // result is average delay in hours to enter city
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- parking spaces = 5000000, previous * 0.0002
- // estimated in thousands, approx 1000 new spaces constructed each year
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- / assumptions for model of number of cars entering city
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- // assumes carpooling will become more attractive
- people per car = 2, 2.5, 3, 3.5, 4, 4.5
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- // use what if scenarios to model the effect of higher tolls for cars
- // with less than 2 people.
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- // assumes city may become more attractive to commuters
- base number of commuters per day = 25000, previous * 1.05
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- // model the effect of the average delay on the number of cars
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- ????? average number of cars entering city each day = 25000 '
- - 2000 * average delay on entering city
- - * average toll increase
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- number of cars entering city = '
- average number of commuters per day / people per car
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- CARS BROUGHT IN BY COMMUTERS
- // DEPENDS ON PARKING, TOLLS, SPEED OF TRAFFIC IN CITY, DELAYS
- // AT CROSSINGS
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- PARKING AVAILABILITY
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- QUALITY OF SUBWAY SERVICE =
- //AVERAGE TIME TO MAKE A 5 MILE TRIP INSIDE THE CITY
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- number of cars in city
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- mean traffic speed at crossings
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- mean traffic speed in city
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- pollution at crossings = emissions from cars entering city '
- * average delay on entering city
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- pollution in city = emissions from cars in city * average delay at intersections
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- emissions from cars entering city = pollution per car *
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- // DELAYS AT CROSSINGS AFFECTED BY
- // ANTICIPATED INCREASES IN NUMBER OF PEOPLE COMING INTO CITY
- // CONCLUSION OF REPAIRS-->RISE OF NUMBER OF PEOPLE COMING INTO CITY
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- MEAN TRAFFIC SPEED = F(NUMBER OF CARS IN CITY)
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- MEAN TRAFFIC SPEED = 3.5, previous * 0.75
- //MILES PER HOUR
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- // use what if scenarios to model the effect of
- // 1. a plan to discourage driving
- // 2. a plan to improve roads
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- // interpolation for pollution per car in terms of mean traffic speed:
- // assumes that as speed gets lower, cars become more inefficient and burn
- // more fuel, releasing more pollutants.
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- // note: speed in miles per hour, pollution in parts per million
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- pollution per car = interpolation on (mean traffic speed, '
- 0, xx .5,xx 1,xx, 1.5,xx, 2,xx, 2.5,xx, 3,xx, 3.5, 4,xx)
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- // we want to capture that many people turn off engine at < 1 mph
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- pollution from cars = number of cars in city * pollution per car
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- respiratory infections = constant + previous * distribution
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- NUMBER OF CARS IN CITY= F(ATTRACTIVENESS)
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- CARS OWNED BY RESIDENTS
- // FUNCTION OF PARKING AVAILABILITY AND QUALITY OF SUBWAY SERVICE
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- BUSINESS COSTS AND TAX BASE AFFECTED BY SPEED OF TRAFFIC IN CITY
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- FAILURE COST OF EXCEEDING POLUTION LIMIT
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- BUDGET DETERMINED BY
- TOTAL TAX BASE
- TAX RATE
- AMOUNT EXPECTED FEDERAL GOVT
- AMOUNT EXPECTED FROM STATE GOVT (EXPECTED TO DECLINE)
- SALE OF BONDS --> INTEREST EXPENSE
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