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How is a Roundabout different than a traditional intersection?
  • Instead of a red/yellow/green traffic light to follow, a roundabout is a circle of traffic with yield signs at each entry point.
  • Allows flowing traffic with little to no stopping
  • Easy to navigate through
  • Safer than a traditional intersection
  • The Insurance Insititute for Highway Safety
    • Roundabouts reduce collisions of ALL Types - 39%
    • Roundabouts reduce Injury - 76%
    • Roundabouts reduce Fatal and Incapacitating Injuries - 89%
  • Pedestrian traffic is 50% less likely to get hit at a roundabout
  • Reason for Roundabout safety includes:
    • Slower traffic speeds
    • Smaller collision angles
    • Fewer conflict points
Navigating a Roundabout
  • When approaching a roundabout you will see a dashed white line
  • Slow down, signal, and Yield to traffic
  • When you see a safe opening for you and your car proceed into the Roundabout
  • Folow the circle of traffic until you see the road you want to continue on and merge out of the Roundabout

Please keep in mind that all Roundabouts work the same but they may not LOOK the same.  Some Roundabouts have a single lane of traffic while others may have two lanes for drivers. 

Features of a Roundabout
  • Most Roundabouts are designed with a Truck Apron to accommodate large vehicles like school buses, semi trucks and farm equipment.  The truck apron allows larger vehicles more room to maneuver through the roundabout.  Please remember to give larger vehicles plenty of room to make their way through the roundabout.
  • The number of entry and exit points may vary from each roundabout
  • Some may be more oval than circular
  • Although the looks of roundabouts may differ, the way you navigate through a roundabout never changes.
Benefits of a Roundabout
  • Cost.  Roundabouts are less expensive to maintain than traffic signal intersections.
  • Savings on a roundabout include operating expenses and utility expenses
  • Roundabouts are more "green" than signalized intersections
  • Vehicles don't stop and idle as much so there are less car emissions than with a traffic signal intersection
  • Landscaped center is more attractive than metal poles and signals


Today’s drivers face different challenges than in the past. Changes in driving patterns, increased distractions, and advances in technology have all impacted driving conditions. In response to these changes, improvements to road design have been developed, including the modern roundabout.

Intersections are among the most deadly of road dangers. This is mainly due to the speed of the vehicles when they fail to heed traffic controls, whether that control be a stop sign, four-way stop, or traffic signal. Roundabouts minimize this danger as they are designed to “calm” traffic by lowering the speed of the vehicles as they enter the roundabout. Research has found a 90% decrease in fatalities by construction of a roundabout over the use of a signalized intersection, with a 75% decrease in injury crashes and a 37% reduction in total crashes.

Authorities at the state and federal level have recognized the value of roundabouts in increasing safety, reducing air pollution and fuel use, and promoting traffic flow. To encourage the implementation of roundabouts, the federal government provides grants to local agencies to help fund their construction. This assistance allows road commissions to stretch limited transportation dollars while improving traffic safety for the residents and motorists.

The St. Clair County Road Commission pursues every opportunity to improve the safety and efficiency of the county’s road and bridge system. Modern roundabouts represent one more tool used to achieve that important goal.





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