Draft Design Guidelines to Accommodate Peds and Bikes at Interchanges

Meghan MitmanFehr & Peers

August 15, 2011

Background

Goals

Where does the Freeway end?

Leaving the Freeway, Entering a Neighborhood

Guiding Principles

On-Ramps

Dashed bike lane begins before on ramp lane; optional exit ramp

Dashed bike lane begins before on ramp lane; optional exit ramp Directional curb ramps

with truncated domes, high visibility striping provided for all crosswalks

Directional curb ramps with truncated domes, high visibility striping provided for all crosswalks

Landscape buffer provided between sidewalk and bike lanes, including on the structure as feasible

Landscape buffer provided between sidewalk and bike lanes, including on the structure as feasible

Crosswalk located in location with lowest speed and highest visibility

Crosswalk located in location with lowest speed and highest visibility

Ramp geometrics minimize speed for vehicles leaving the arterial

Ramp geometrics minimize speed for vehicles leaving the arterial

HOV Lane added downstream of crosswalk

HOV Lane added downstream of crosswalk

Bike weaving zone provided through long on-ramp

Bike weaving zone provided through long on-ramp

Advance yield limit line provided on dual lane crossing (advance stop bar if signalized). Bicyclists have option to use crosswalk (with ramps).

Advance yield limit line provided on dual lane crossing (advance stop bar if signalized). Bicyclists have option to use crosswalk (with ramps).

Raised (landscaped) buffer provided between bike lane and on-ramp lanes

Raised (landscaped) buffer provided between bike lane and on-ramp lanes

Off -Ramps

Ramp geometrics minimize speed for vehicles leaving the freeway. Ramp is stop controlled.

Ramp geometrics minimize speed for vehicles leaving the freeway. Ramp is stop controlled.

Optional bicycle exit ramp

Optional bicycle exit ramp

Bike lane crossing - detail

In this configuration, ramps should be signalized. Bicycle detection and optional ramps accommodate bikes at the crosswalk.

In this configuration, ramps should be signalized. Bicycle detection and optional ramps accommodate bikes at the crosswalk.

Advance yield limit line is provided across dual lane ramp. Advance stop bar if signalized.

Advance yield limit line is provided across dual lane ramp. Advance stop bar if signalized.

SPUIs

Source: FHWA 17-20

Solution: Two-step crossing (one step during vehicle phase 2 and the other Solution: Two-step crossing (one step during vehicle phase 2 and the other during vehicle phase 3)during vehicle phase 3)

Possible ped crosswalksVehicle phase 1Vehicle phase 2Vehicle phase 3

With most SPUIs there is never a phase when pedestrians can cross the urban With most SPUIs there is never a phase when pedestrians can cross the urban arterial without conflictarterial without conflict

Each stage is coordinated with the downstream signal in the same direction

Each stage is coordinated with the downstream signal in the same direction

Source: FHWA 17-22

Possible ped crosswalksVehicle phase 1Vehicle phase 2Vehicle phase 3

Peds with vehicle phase 2

Peds with vehicle phase 3

Skip Striping throughComplex Intersections

Advance crosswalk controlled with a signal or HAWK beacon

Advance crosswalk controlled with a signal or HAWK beacon

Determining Crosswalk Treatments

Note: Spreadsheet should supplement engineering judgment and should be used in conjunction with treatment fact sheets per NCHRP Report 562. Credit: Fehr & Peers, April 2008. Version 1.02

Thank You!

Meghan Mitman

415-384-0300

m.mitman@fehrandpeers.com

Design Assumptions

High Speeds, Poor Visibility

Prefer Slow Speed, Right Angle Urban Designs

Source: FHWA 17-32

Flat angle = wide crossing & high-speed turns

Tight angle = short crossing & slow speed turnsSpringfield ORSpringfield OR

Old ramp alignmentOld ramp alignment

Positive example: reconfigured ramp terminusPositive example: reconfigured ramp terminus

Source: FHWA 17-33

Red line = old crosswalkRed line = old crosswalk Green line = new crosswalkGreen line = new crosswalk

Springfield OR

Savings in Land Area, Less Ped “Dead Zone”

What you don’t see in this presentation…Right turn lane adjacent to shared right-thru