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Transportation Planning: Impact of SR 520 Bridge Closure on Morning Peak Hour Traffic, Assignments of Transportation Engineering

University of Washington (UW) - Seattle Transportation Engineering

Information for students in a transportation engineering course (cee 320) to estimate the impact of closing the westbound lanes of the sr 520 bridge for a 24-hour period on morning peak hour traffic. Data from past consultant reports, poisson regression and logit models, and highway performance functions. Students are required to use this information to determine the increase in travel time on i-90 and sr 522, the resulting level of service on the i-90 bridge, and the travel time savings for the remaining two routes using system optimal route choice.

Typology: Assignments

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Uploaded on 03/18/2009

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CEE 320 Instructor:

Winter Quarter 2006 Steve Muench

Homework 5: Transportation Planning

Textbook Assignment

Problem Points Answer

8.5 10 E[T] = 1.455

8.7 10 1775 drive alone, 974 share a ride, 1251 take the bus

8.8 10 66 trips to SC1, 7 trips to SC2, 118 trips to SC3, 3809

trips to SC4

Additional Required Work (70 points)

WSDOT wishes to know the impact of closing the westbound lanes of the SR 520 bridge

for a 24-hour period on a weekday (this is quite likely for inspection after a storm).

Estimate the impact of this proposed lane closure on morning peak hour traffic to include:

1. The increase in travel time on I-90 and SR 522 (Lake City Way) due to the bridge

closure.

2. The resulting level of service (LOS) on the I-90 bridge (westbound direction

multipurpose lanes only, not express lanes) as a result of the SR 520 bridge

closure.

3. The travel time savings that can be realized for the remaining two routes (SR 522

and I-90) by using a system optimal route choice solution instead of a user

equilibrium route choice solution.

Information available to you from past consultant reports follows.

Report #1 Summary

There are 3 primary routes from the east side to downtown Seattle. 15,000 Kirkland and

Bellevue area households generate 81% of all trips on these 3 primary routes. Remaining

trips are generated by other households not in the immediate vicinity of the Lake.

The three primary routes are:

Route Name Route Description

SR 520 South on I-405, west on SR 520, then south on I-5

SR 522 North on I-405 (if necessary), southwest on SR 522, then south on I-5

I-90 South on I-405, west on I-90, the north on I-5

Report #2 Summary

Estimates a Poisson regression model for trip generation and a logit model for mode

choice for these same 15,000 households during the morning peak hour. This study

concluded that each of the 15,000 households could be placed in one of four profile

categories (this is a bit of a simplification, but necessary to limit busywork). Each profile

category is associated with a specific set of variables for each model as listed in the “Trip

Generation Poisson Regression Model” and “Mode Choice Logit Model” tables on the

following pages.

1

Discover Assignments of Transportation Engineering University of Washington (UW) - Seattle

Partial preview of the text

Download Transportation Planning: Impact of SR 520 Bridge Closure on Morning Peak Hour Traffic and more Assignments Transportation Engineering in PDF only on Docsity!

CEE 320 Instructor: Winter Quarter 2006 Steve Muench

Homework 5: Transportation Planning

Textbook Assignment

Problem Points Answer

8.5 10 E[T] = 1.

8.7 10 1775 drive alone, 974 share a ride, 1251 take the bus

8.8 10 66 trips to SC1, 7 trips to SC2, 118 trips to SC3, 3809

trips to SC

Additional Required Work (70 points)

WSDOT wishes to know the impact of closing the westbound lanes of the SR 520 bridge

for a 24-hour period on a weekday (this is quite likely for inspection after a storm).

Estimate the impact of this proposed lane closure on morning peak hour traffic to include:

1. The increase in travel time on I-90 and SR 522 (Lake City Way) due to the bridge

closure.

2. The resulting level of service (LOS) on the I-90 bridge (westbound direction

multipurpose lanes only, not express lanes) as a result of the SR 520 bridge

closure.

3. The travel time savings that can be realized for the remaining two routes (SR 522

and I-90) by using a system optimal route choice solution instead of a user

equilibrium route choice solution.

Information available to you from past consultant reports follows.

Report #1 Summary

There are 3 primary routes from the east side to downtown Seattle. 15,000 Kirkland and

Bellevue area households generate 81% of all trips on these 3 primary routes. Remaining

trips are generated by other households not in the immediate vicinity of the Lake.

The three primary routes are:

Route Name Route Description

SR 520 South on I-405, west on SR 520, then south on I-

SR 522 North on I-405 (if necessary), southwest on SR 522, then south on I-

I-90 South on I-405, west on I-90, the north on I-

Report #2 Summary

Estimates a Poisson regression model for trip generation and a logit model for mode

choice for these same 15,000 households during the morning peak hour. This study

concluded that each of the 15,000 households could be placed in one of four profile

categories (this is a bit of a simplification, but necessary to limit busywork). Each profile

category is associated with a specific set of variables for each model as listed in the “Trip

Generation Poisson Regression Model” and “Mode Choice Logit Model” tables on the

following pages.

CEE 320 Winter Qua Instructor: rter 2006 Steve Muench

Report #3 Summary

Surveyed the east side and found that a carpool accommodates 2.2 person-trips on the

average, and a bus accommodates 50 person-trips on the average.

Report #4 Summary

Estimates the highway performance functions (HPFs) for the SR 520, SR 522 and I-

routes as:

90 90 522 522 520 520

t x

The “t” values are in minutes and the “x” values are in thousands of vehicles per hour.

Instructor: rter 2006 Steve Muench

Mode Choice Logit Model CEE 320Winter Qua Variable Coefficient Profile 1values Profile 2values Profile 3values Profile 4values Car logit equation Constant

Car Accessibility/Availability (High)

Peak Hour Destination Parking in dollars per hour

Travel Time Cost for Car (1 if High)

Income

Master's Degree or Higher

Kids

Carpool logit equation Constant

Carpool Accessibility/Availability (High)

Peak Hour Destination Parking Waive for Carpool

Travel Time Cost for Carpool (1 if High)

Income

Master's Degree or Higher

Kids

Bus logit equation Bus Accessibility/Availability (High)

Travel Time Cost for Bus (1 if High)

CEE 320 Winter Quarter 2006 Hints and Recommendations

Transportation Planning: Impact of SR 520 Bridge Closure on Morning Peak Hour Traffic, Assignments of Transportation Engineering

Related documents

Partial preview of the text

Download Transportation Planning: Impact of SR 520 Bridge Closure on Morning Peak Hour Traffic and more Assignments Transportation Engineering in PDF only on Docsity!

Homework 5: Transportation Planning

Textbook Assignment

Problem Points Answer

8.5 10 E[T] = 1.

8.7 10 1775 drive alone, 974 share a ride, 1251 take the bus

8.8 10 66 trips to SC1, 7 trips to SC2, 118 trips to SC3, 3809

trips to SC

Additional Required Work (70 points)

WSDOT wishes to know the impact of closing the westbound lanes of the SR 520 bridge

for a 24-hour period on a weekday (this is quite likely for inspection after a storm).

Estimate the impact of this proposed lane closure on morning peak hour traffic to include:

1. The increase in travel time on I-90 and SR 522 (Lake City Way) due to the bridge

closure.

2. The resulting level of service (LOS) on the I-90 bridge (westbound direction

multipurpose lanes only, not express lanes) as a result of the SR 520 bridge

closure.

3. The travel time savings that can be realized for the remaining two routes (SR 522

and I-90) by using a system optimal route choice solution instead of a user

equilibrium route choice solution.

Information available to you from past consultant reports follows.

Report #1 Summary

There are 3 primary routes from the east side to downtown Seattle. 15,000 Kirkland and

Bellevue area households generate 81% of all trips on these 3 primary routes. Remaining

trips are generated by other households not in the immediate vicinity of the Lake.

The three primary routes are:

Route Name Route Description

SR 520 South on I-405, west on SR 520, then south on I-

SR 522 North on I-405 (if necessary), southwest on SR 522, then south on I-

I-90 South on I-405, west on I-90, the north on I-

Report #2 Summary

Estimates a Poisson regression model for trip generation and a logit model for mode

choice for these same 15,000 households during the morning peak hour. This study

concluded that each of the 15,000 households could be placed in one of four profile

categories (this is a bit of a simplification, but necessary to limit busywork). Each profile

category is associated with a specific set of variables for each model as listed in the “Trip

Generation Poisson Regression Model” and “Mode Choice Logit Model” tables on the

following pages.

Report #3 Summary

Surveyed the east side and found that a carpool accommodates 2.2 person-trips on the

average, and a bus accommodates 50 person-trips on the average.

Report #4 Summary

Estimates the highway performance functions (HPFs) for the SR 520, SR 522 and I-

routes as:

t x

t x

t x

The “t” values are in minutes and the “x” values are in thousands of vehicles per hour.

Your report will require work in several parts. For each part, clearly state your

assumptions as part of your answer. Show your work (e.g., calculations, spreadsheets,

etc.).

Part 1

Using the Poisson regression model, find the total number of household trips for the

15,000 subject households during the morning peak hour. Knowing that these trips make

up 81% of all trips, you should be able to estimate the total number of trips.

Part 2

Using the logit model, determine the mode split of these trips between buses, cars and

carpools.

Part 3

Using this mode split and the estimated person-trips per vehicle from report #3, you can

determine the total vehicle generation during the morning peak hour.

Part 4

Knowing the total vehicle generation during the morning peak hour you can assign the

vehicles to the three routes using user equilibrium or system optimal route choice. You

must decide which assignment is most appropriate and then justify your choice. You can

then do the same thing again using only the SR 522 and I-90 routes.

Part 5

To determine the LOS on I-90 you will need to determine bridge characteristics. Keep in

mind which direction the express lanes are traveling during the morning peak hour and

who is allowed on these lanes (carpools and buses only). You need to make assumptions

about where the carpools will be on I-90 (in the HOV express lanes or in the general

purpose lanes). Please do not actually go out on the bridge and measure things like lane

width. You may estimate these items from online resources at WSDOT’s transportation

data office Web page (http://www.wsdot.wa.gov/mapsdata/tdo). Items of specific

interest are:

(http://www.wsdot.wa.gov/mapsdata/tdo/srweb.htm)

(http://www.wsdot.wa.gov/mapsdata/tdo/annualtrafficreport.htm)