Speed Bump Safety

1
Speed Bump Safety

• Kyle Hays
• Kris Olinger
• Michael Young
• Karen Vann

2
Objective

• Evaluate safety benefits of speed bumps that have
  been in place for over 5 years.

3
Outline of Presentation

• Types of Speed Bumps
• Data Collection/Methodology
• Results data comparison
• Negative Impacts Environmental and Emergency
  Services
• Limitations further studies

4
Types of Speed Bumps

• Median - 1,000-1,500 each
• 14-foot residential streets w/25 mph limit
• 22-foot neighborhood collector w/30 mph limit
  or a fire response route

14 or 22 foot wide
5
Types Costs

• Offset (Split) - 6,000-6,500 each

6
Methodology

• Reviewed existing reports
• existing speed bump speed and volumes
• accident history
• Selected previously reviewed streets to perform a
  current speed study
• Compared current data with existing
• Researched other factors
• emergency vehicles
• environmental impacts

7
Data Collection

• Existing Studies
• Kittleson Peer Review 1998
• PDOT Traffic Calming Program website
• Accident History 2002
• Emergency response information
• Field work

8
Site Photos

• Speed Bump Street

Parallel Control Street
9
Data Collection
10
Speed Data for SE 58th
11
Parallel Speed Vs. Volume
12
Crash Data Comparison
13
Public Perceptions

• People in favor of traffic slowing devices on
  parallel street
• Josh Hatch, resident of SE 62nd Ave

14
Negative Impacts Fire Trucks

• Fire trucks
• can lose up
• to 9 seconds
• per speed
• bump
• Wear and
• tear on trucks

15
Negative Impacts Fire Trucks - Solutions

• Emergency Response Routes
• Major vs. minor
• Creative speed bump varieties
• Split speed bumps

16
Environmental Impacts

• Noise
• Overall decrease due to decrease in traffic
  volumes speeds
• Isolated increase especially for delivery-type
  trucks buses
• Pollution
• Fuel consumptions emissions slightly increase
  from decelerating and accelerating

17
Conclusions

• Speed bump street speeds and volumes were lower
  than on parallel streets
• Future Analysis
• More data, particularly during the peak hour
  (4-6 PM)
• More crash data (speed bumps installed less
  recently)
• Standardized Procedures