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114 W. Commerce
San Antonio, Texas 78205
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Medians: Forced Turn Islands

Forced turn islands are raised islands that block turn movements on approaches to an intersection. Forced turn islands may reduce traffic congestion, crashes, and/or help reduce cut-through traffic.

Force Turn Island


  • Prohibits dangerous turning movements and improves safety
  • Reduces the volume of vehicles on a cut-through route that crosses a major street


  • Traffic problem may be diverted to a different street
  • Local street drainage may be impacted
  • May cause sight distance challenges for right turning vehicles as drivers enter intersection at a skewed angle

Eligibility Considerations

  • Cut-through traffic should represent 25 percent or more of the total daily street volume
  • Accident history that would support the installation of a forced turn island Street should be wide enough to construct a turn islands
  • Signs and vegetation must conform to the Clear Vision Area ordinance Neighborhood Association Landscape Maintenance Agreement required if landscaping is included


Reduced Speed One Star   Reduced Volume No Star
Enhanced Safety One Star   Maintenance Three Star

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