The document discusses safety issues at the intersection of Bundy Drive and Mayfield Avenue in Los Angeles and potential solutions. It considers alternatives like all-way stop signs, rectangular flashing beacons, and a traffic signal. It focuses on the benefits of installing a single-lane roundabout, which could reduce speeds, decrease congestion, and lower the severity of crashes compared to other options. Research from transportation organizations indicates that roundabouts have led to fewer injuries and fewer fatalities at other intersections.

1. The Los Angeles
Department of
Transportation

2. Zaki Mustafa
Principal Transportation Engineer
Past President Institute of Transportation Engineer
Mohammad Blorfroshan
Senior Transportation Engineer

3. Meeting Outline
n Project history
n Project
alternatives
n Roundabout
discussion
n Questions

4. Bundy & Mayfield

5. Safety

6. Safety

7. Safety

8. Issues with Bundy Corridor
n Pedestrian Safety
n Cars driving too fast on Bundy
n Vehicle right of way
n Few north-south streets through Brentwood
n Stop signs lead to congestion on Bundy
n Cars backing up onto Wilshire

9. Bundy & Mayfield
n Remove stop signs on Bundy
n All-way stop signs
n Rectangular flashing beacons
n Mini roundabout
n Traffic signal

10. All-Way Stop Sign
n Pros
n Reduces speeding
n Increases ped safety
n Cost
n Aesthetics
n Cons
n Increases congestion
n Decreases ped safety
n No marked crosswalks currently

11. Rectangular Flashing Beacons
n Pros
n Increases ped safety
n Decreases congestion
n Aesthetics
n Cons
n Cons
n Increases speeding
n Decreases ped safety

12. Traffic Signal
n Pros
n Reduces congestion
n Increases ped safety
n Decreases speeding
n Cons
n Increases speeding
n High cost
n Aesthetics

13. Roundabout
n Pros
n Decreases speeding
n Increases ped safety
n Reduces congestion
n Aesthetics (phase II)
n Cons
n Cost
n Aesthetics (phase I)

14. Roundabout

15. Roundabout
n Removing traffic control can increase driver
awareness
n Speeding reduces because forced change of
direction
n Lower speeds reduce crash severity
n Roundabouts place pedestrians in a more visible
location.

16. 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 collisions
75 percent reduction in injury collisions
90 percent reduction in fatality collisions
40 percent reduction in pedestrian collisions
n Roundabouts promote safety in several ways.

17. Proven to be Effective
n Reduction in Crashes
n Severity of Injury is reduced because of the slower speed
20-25mph
n Reduction of Rear End Crashes
n Reductions in injury crashes of 72-80 percent
n Reductions in all crashes of 35-47 percent.
n Reduces Over all Speed
n Roundabouts replaced stop signs found that vehicle delays
were reduced 13-23 percent

18. Proven to be Effective

19. Proven to be Effective
n Institute for Highway Safety (IIHS)
n Institute of Transportation Engineers
n FHWA
n Transportation Research Board
n NACTO
n CALTRANS
n Other State Agencies

25. LADOT
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