Case Study 5

Museum Road

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Observations?

Gainesville, Florida 100,000 population

University of Florida 46,000 students 11,000 employees

Museum Road

Analyze the impact of a new parking structure on campus Increased traffic Impacts on two-way

stop-controlled intersection

Alternatives toward a workable solution

Three HCM problems

Museum RoadLocation of the case study area on the University of Florida campus

Observations?

Case Study Objectives

Both signalized and unsignalized analyses Considerations in a multimodal environment

Impacts of pedestrians, bicycles and buses Input data and common assumptions Limitations of HCM procedures

Interpret analysis results Support transportation system decisions

Museum Road

Center of campus Two-lane roadway 20-mph speed limit

Bicycles Buses Pedestrians

UF Campus

Unique peaking characteristics?

Four closely-spaced intersections

Signalized Two actuated One pretimed

Unsignalized Two-way stop

control

Museum Road - Urban Street Considerations

North-SouthDrive

Reitz UnionDrive

CenterDrive

NewellDrive

Buses and pedestrians

Bus Stops Bus Pullovers

Crosswalks Parking Lots

Museum Road Characteristics

Museum Rd.

N-S Dr.

Reitz U.

Center Dr. Newell Dr.

Bus stops with pulloversBus stops

Parking Crosswalk

N-S Dr.Reitz U.

Center Dr. Newell Dr.

Consider the situation just described Who are the affected stakeholders? What do you see as potential issues here?

Issues to consider: _________________________ _________________________ _________________________ _________________________

Museum Road

Observations?

University students University employees University administration Pedestrian advocates Bicycle advocates Public transit agencies Campus police

Stakeholders

Who are the stakeholders?

Signalized urban street Signals and TWSC Multimodal purposes

Vehicle mobility not primary Pedestrians

Substantial mid-block activity Controlled and uncontrolled

Bicycles Bicycle lanes on both sides

Museum Road

Signalized intersection Actuated control Protected-permitted left turns Pedestrian signals

High traffic demand Could exceed capacity Queues are issues

Could block adjacent intersections

North-South Drive

Unsignalized intersection Two-way stop control

High demand Could exceed capacity

Signalizing difficult Near North-South Drive Restrictive geometry Heavy LT into new structure

Reitz Union Drive

Signalized intersection Pretimed control Two-phase Pedestrian signals

Unusual approach configuration One-way approaches Turn restrictions Bus staging area

Center Drive

Signalized intersection Actuated control Protected LT on Museum Road Pedestrian signals

Requests pending Protected LT on Newell Drive Exclusive pedestrian phase

Lower vehicle volumes

Newell Drive

After seeing some specifics about the area … How does this compare with a typical impact

study? What are some unique characteristics here?

Characteristics for focus: _________________________ _________________________ _________________________ _________________________

Museum Road

Observations?

Museum Road Issues

Focus of the case study New parking structure Intersection control

Whether to signalize Affects entire Museum Road

Can you see some of the issues to be addressed?

Reitz Union DriveInto

ParkingStructure

Problem 1: Existing and projected operations TWSC versus signal Pedestrian effects Lane configuration

Problem 2: Signalized intersection Phasing and timing alternatives Exclusive pedestrian phasing Actuated versus coordinated timing

Problem 3: Actuated phasing Delay versus v/c ratio Pedestrian level of service

Reitz Union Drive

1a. TWSC analysis - Existing conditions - Pedestrian effects- Projected conditions

1b. Signalized analysis - Actuated control- Compare with TWSC- Total delay comparison

1c. Pedestrians and bicycles - Signalized comparison- Geometry modifications- Queues, delays and LOS

Problem 1

TWSC Analysis

Data required Existing delay and LOS Projected delay and LOS Pedestrian effects TWSC limitations

Problem 1a

TWSC data requirements

Lane configuration Turning movement

volumes Pedestrian volumes Peak-hour factors Approach grades Heavy vehicle

percentages

Right-turn lanes Shared

Right turns share a lane with other (thru or left) movements

Flared Shared lane where right turns can slip by queued vehicle(s)

Exclusive Right turns have their own adjacent lane

Channelized Exclusive lane with a triangular island where right

turns must comply with a stop or yield sign

Problem 1a

Peak-Hour Factor (PHF) Converts hourly volume to peak 15-minute flow

rate

PHF = (average flow rate) (4 * Peak 15-minute flow rate) = 2220 + 4220 + 2895 + 3305

4 * 4220     = 12,640/16,880 = 0.75

Problem 1a

Volume data Existing turning movement volumes Future turning movement volumes

Problem 1a

Shows:Level of demand at this intersection andProjected growth generated by the new structure

Results Initial analysis of existing conditions

SB delay at LOS F even before adding the traffic that will be generated by the new parking structure

NB delay shows LOS F at "999 sec" Even though very little traffic – delay in "sec/vehicle" Illustrates practical limits imposed by some software

Problem 1a

Pedestrian effects 250 pedestrians per hour to EB, WB and SB approaches 150 pedestrians per hour to NB approach

Without pedestrians Delays high and queues acceptable

With pedestrians Delays skyrocket and queues triple

Problem 1a

Projected traffic Projected traffic volumes reflecting new parking structure Compared with volume levels before the generated traffic

Projected queues and delay Southbound queues show marked increase

Compared with existing queues and delay Delays are very high under both scenarios

Problem 1a

Problem 1b

MUTCD warrants Warrant analysis is normally necessary Manual on Uniform Traffic Control Devices (MUTCD)

Millennium Edition (2003 Update) Eight signal warrants

Traffic, delays, pedestrians, schools, crashes, network Establish thresholds for potential signalization

http://mutcd.fhwa.dot.gov/

Signalized analysisTWSC analysis shows substantial delays and queuesInvestigate signalization for operational improvements

Signalized Analysis

Data required Existing delay and LOS Projected delay and LOS Compare results with

TWSC Total delay comparison

Problem 1b

Signal data requirements

Signal phasing Signal timing Arrival type Unit extension Lost time data Parking and maneuvers Bus stop data Lane utilization

Problem 1b

Signalized analysis

Results from existing conditions

Queues Signal creates Museum queues, but reduces Reitz queues

Delay Signal increases Museum delays, but reduces Reitz delays

Signalized analysis

Results from projected conditions

EB left and SB right still have significant delay

How can this comparison really be made?

Problem 1b

Problem 1b

Signal versus TWSC

Total delay comparison

Total Reitz Union Drive delay reduction Exceeds Museum Road delay increase Total delay reduced by adding the signal

Problem 1c

Signalized analysis Considering pedestrian and bicycle effects

Especially affecting the SB right turning vehicles

What alternatives might be considered here?

Problem 1c

Signalized analysis Restricting pedestrians on two approaches

Pedestrians allowed on east and south legs only

What else might be considered?

Problem 1c

Signalized analysis Convert to a T intersection Dual SB right turn lanes

Delays and queues are reduced Especially the EB left turns and SB right turns Intersection from LOS F to LOS D

Problem 1c

Signal versus TWSC Total delay comparison

With improved T intersection

86% reduction in total delay