United States Department of Transportation - Federal Highway Administration FHWA Home Feedback
   CALENDAR OF EVENTS divider TRAINING divider TECHNOLOGY DEPLOYMENT divider TECHNICAL ASSISTANCE
   Home   divider  end of menu

Photo: Traffic light

Safety & Design Home
space image
Safety & Design Solutions/Best Practices
space image
Safety & Design Training
space image
Safety & Design Newsletters and Publications
space image
Safety & Design Calendar
space image
Safety & Design Links
space image
 

FHWA Resource Center

SAFETY & DESIGN TEAM

Solutions

Roundabouts
Safety and Design Technical Services Team

of a roundabout intersection with cars driving through it.

Caption: Photo of a roundabout intersection with cars driving through it.

PRODUCTS & SERVICES
A roundabout is a one-way, circular intersection in which traffic flows around a center island. Roundabouts are designed to meet the needs of all road users-drivers, pedestrians, pedestrians with disabilities, and bicyclists. A roundabout eliminates some of the conflicting traffic, such as left turns, which cause crashes at traditional intersections. Because roundabout traffic enters or exits only through right turns, the occurrence of severe crashes is substantially reduced. Small-angle collisions that may occur as a result of a right-hand turn are typically less severe than other types of collisions.

One of the reasons that roundabouts succeed is because their design effectively decreases driving speed to typically 48 kilometers (30 miles) per hour or less.

Roundabouts have the following benefits over traditional signalized intersections:

- Crashes are less severe than other intersection crashes.
- Safer than traditional intersections.
- Cost-effective way to improve intersection safety.
- Increased traffic capacity and improved traffic flow.
- No signal equipment to maintain.
- Aesthetic benefits.

The professionals of the Safety & Design team have experience with all aspects of roundabout design and can suggest ways in which they can improve traffic flow safety in a community.

Transportation professionals seeking training in the design of roundabouts, ideas for sharing information with the local community, or assistance with a building project may contact the Resource Center Safety & Design team.

Workshops, Seminars and Courses

Roundabouts - Planning and Designing Safer Intersections
This workshop presents an introduction to planning and designing roundabout intersections for safety. The workshop is highly interactive with numerous discussions, examples, case studies and exercises.

The workshop covers the following topics:

- Distinguishing modern roundabouts from other types of circular intersections.
- Roundabout safety results and predicting intersection safety performance.
- Traffic operational models and capacity calculation exercises.
- Planning considerations for making good intersection design decisions.
- Public education strategies.
- Roundabout geometric design principles.
- Signing and marking.
- Pedestrian and bicyclist accommodations.
- Roundabouts on rural high-speed corridors.
- Single and multi-lane roundabouts.

Aerial photo of a roundabout.

Caption: Aerial photo of a roundabout.

For more information contact:
Mark Doctor, Safety Engineer
Atlanta, GA
(404) 562-3732
mark.doctor@dot.gov

SAFETY AND DESIGN TECHNICAL SERVICES TEAM
Patrick Hasson
Team Manager
(708) 283-3595
patrick.hasson@dot.gov


FHWA Resource Center logo
yellow circle
CONTACT US
staff / phones

Technical Service Teams
Air Quality

Civil Rights

Construction & Project Mgmt

Environment

Finance Services

Geotechnical

Hydraulics

Operations

Pavement & Materials

Planning

Safety & Design

Structures

FHWA Logo

FHWA Home | Feedback
United States Department of Transportation · Federal Highway Administration