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- 'da <br />a� _ �, <br />� � <br />�:� .�: <br />Best Locations: <br />• �Vlultipl�-lane rt�adways <br />• High-�olume raadways <br />• High-speed roadways <br />• Inadequate visibility t�f p�destrians <br />• Vehicfe speed5 causing problems <br />Planning Le�el CoSt (ZD19}: <br />• $2,14(] - $41,170, AWerage $13,52fl <br />5aurce: FHWA <br />� � ��� <br />Design Consid�rations: <br />• Island width: minimum af 4 feet <br />• Preferred island width: 8 feet <br />• Must facilitate drainage <br />• Accessibility: ADA-compliant ramps <br />