Date post: | 16-Aug-2015 |
Category: |
Engineering |
Upload: | zaki-mustafa |
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The Los Angeles Department of Transportation
Zaki Mustafa Principal Transportation EngineerPast President Institute of Transportation Engineer
Mohammad BlorfroshanSenior Transportation Engineer
Meeting Outline
n Project historyn Project
alternativesn Roundabout
discussionn Questions
Bundy & Mayfield
Safety
Safety
Safety
Issues with Bundy Corridor
n Pedestrian Safetyn Cars driving too fast on Bundyn Vehicle right of wayn Few north-south streets through Brentwoodn Stop signs lead to congestion on Bundyn Cars backing up onto Wilshire
Bundy & Mayfield
n Remove stop signs on Bundyn All-way stop signsn Rectangular flashing beaconsn Mini roundaboutn Traffic signal
All-Way Stop Signn Pros
n Reduces speedingn Increases ped safetyn Costn Aesthetics
n Consn Increases congestionn Decreases ped safety
n No marked crosswalks currently
Rectangular Flashing Beacons
n Prosn Increases ped safetyn Decreases congestionn Aesthetics n Cons
n Consn Increases speedingn Decreases ped safety
Traffic Signaln Pros
n Reduces congestionn Increases ped safetyn Decreases speeding
n Consn Increases speedingn High costn Aesthetics
Roundaboutn Pros
n Decreases speedingn Increases ped safetyn Reduces congestionn Aesthetics (phase II)
n Consn Costn Aesthetics (phase I)
Roundabout
Roundaboutn Removing traffic control can increase driver
awarenessn Speeding reduces because forced change of
directionn Lower speeds reduce crash severityn Roundabouts place pedestrians in a more visible
location.
Proven to be Effective
n Roundabouts reduced injury crashes by 75 percent at intersections where stop signs or signals were previously used for traffic control, studies have shown that roundabouts typically achieve:
37 percent reduction in overall collisions75 percent reduction in injury collisions90 percent reduction in fatality collisions40 percent reduction in pedestrian collisions
n Roundabouts promote safety in several ways.
Proven to be Effectiven Reduction in Crashes n Severity of Injury is reduced because of the slower speed
20-25mphn Reduction of Rear End Crashesn Reductions in injury crashes of 72-80 percent n Reductions in all crashes of 35-47 percent.n Reduces Over all Speedn Roundabouts replaced stop signs found that vehicle delays
were reduced 13-23 percent
Proven to be Effective
Proven to be Effectiven Institute for Highway Safety (IIHS) n Institute of Transportation Engineersn FHWAn Transportation Research Boardn NACTOn CALTRANSn Other State Agencies
LADOT
Together we are the BEST !