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/ TooleDesign <br />Best Locations: <br />• Multiple -lane roadways <br />• High -volume roadways <br />• High-speed roadways <br />• Inadequate visibility of pedestrians <br />• Vehicle speeds causing problems <br />Planning Level Cost (2019): <br />• $2,140 - $41,170, Average $13,520 <br />Source: FHWA <br />Design Considerations: <br />• Island width: minimum of 4 feet <br />• Preferred island width: 8 feet <br />• Must facilitate drainage <br />• Accessibility: ADA-compliant ramps <br />