Forced Turn Islands


  • Physical Address
  • Municipal Plaza Building
    114 W. Commerce, 6th Floor
    San Antonio, TX 78205   
  • Mailing Address
  • P.O. Box 839966
    San Antonio, TX 78283-3966
  • Phone
  • 210.207.8022


  • Razi Hosseini, P.E.
    Director/City Engineer
  • Anthony Chukwudolue, P.E.
    Deputy Director
  • Christie Chapman
    Assistant Director
  • Nefi Garza, P.E.
    Assistant Director
  • Luis Maltos, P.E.
    Assistant Director
  • Paul Berry
    Chief Communications Officer
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.

Forced Turn Islands


  • 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          

Enhanced Safety          

Reduced Volume