International
- E 91 European route E91
Australia
- Cairns Western Arterial Road
- Summerland Way
Canada
- British Columbia Highway 91
- British Columbia Highway 91A
- Newfoundland and Labrador Route 91
China
- G91 Expressway
Iran
- Road 91
Israel
- Highway 91 (Israel)
Korea, South
- National Route 91
United States
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- Interstate 91
- U.S. Route 91
- Alabama State Route 91
- Arkansas Highway 91
- California State Route 91
- Colorado State Highway 91
- Florida State Road 91 (unsigned designation for Florida’s Turnpike)
- Georgia State Route 91
- Georgia State Route 91W (former)
- Illinois Route 91
- Iowa Highway 91
- Kentucky Route 91